Specifications: Single wall stove pipe is ideal for installations where there is a minimum 18" clearance from the stove until it enters the chimney. Can't Find Your Stove or Fireplace? This regular 24 gauge stovepipe is for Wood, Oil, Coal, or Gas fuels. D X 48 in. 6 inch Black Pipe Components . How to install wood stove pipes, elbows, and accessories. 8in Stovepipe Adapter. Model: 8DBK-48SS. Stove pipe collars black 24 gauge - matte finish dia 8 inches This gauge material not to be used for solid fuel venting. 24-Gauge. 8 inch Double Wall Stove Pipe Sections $ 208.43. Article #69785075. Heat-Fab Saf-T Pipe Series 6 Inch x 48 Inch Galvanized Steel Single Wall Stove Pipe Length. 8" Diameter Black Stove Pipe Starter Union Connector Double Male Free Shipping $19.99 Free shipping 8" Stove Pipe 90 Elbow adjustable Stainless Steel Black $28.00 Free shipping DuraVent 8DBK-24SS 8" Inner Diameter - DuraBlack Stove Pipe - - Stainless Steel $57.38 Was: $71.72 Free shipping or Best Offer Interior Black Wood Stove Pipe. Features Snap together for a 24" section of 8" black stove pipe 1 3/4" crimped section with lead edge to allow for easy insertion into fittings or additional pipe For use before the first combustible wall or ceiling High Temperature Black coating on both sides 24 Gauge Used to connect the stove to Chimney Pipe Fits most 8" diameter pipe & fittings Black stove pipe 90 degree ells are 24 gauge and used with Black stove pipe. 8 inch Double Wall Stove Pipe. Add To Cart. Available in 1 Finish. $129.99. Buy Now . Used to connect Double Wall Stove Pipe to an existing masonry chimney or a relined masonry chimney with stainless steel liner. Buy Imperial 8 in. 10" DuraBlack Double Skirted Stovetop Adapter. $369.00 $299.00 Save $70.00. Selkirk Sure-Temp 8 in. Anti Downdraft Cowls. Item# 304550. Selkirk Double Wall Stove Pipe - Telescopic - Steel - Black - 6-in dia. 6" DuraBlack Single Wall Black Pipe - 48". Showing all 6 results $ 145.86. 99 (0) Imperial Fireplace Stove Pipe, 6-in x 24-in,Black Matte Finish $23. Clear. 8 inch wood stove double-walled flue pipe - $25 (Vinton) 8 inch flue pipe for wood stove. The double wall construction keeps the outside cooler and thus reduces wall clearances to 6 inches and ceiling clearances to 8 inches. 6" DuraBlack Single Wall Black Pipe - 48". 6 Inch Single Wall. 4" Flue Damper - Matt Black. Saf-T Pipe is made from 22-gauge cold-rolled steel, which is up to 60% thicker than pipe sold in mass-market stores. DCC Pipe Section. back Chimney Liners. Compare. Will black stove pipe be better or last longer? L Stainless Steel Chimney Pipe. . This item SOLD at 2021 Sep 26 @ 19:56 UTC-5 : EST/CDT. Heat-Fab Welded Black Stovepipe Slip Connec . Cowls & Terminals. Use to adapt pipe to ceiling support box or finishing collar. $ 35.00. Connector Union Piece - 24 Gauge. Chimney is a standard masonry with flue liners. 8 inch Single Wall. Pay in 4 interest-free installments of $74.75 with. Configuration: Pipe Length. 6" (female) to 8" (male)-male end is crimped. Choose from welded or snap-lock 24-gauge, heavy-duty 22-gauge, or black stainless steel stove pipes. Most residential wood stoves come equipped with a 6- or 8-inch collar. Step 3 - Make a Wall. Our Price: $64.30. DCC-30 30 Degree Elbow. All components that come into contact with flue gases are built with an inner wall of corrosion resistant super ferritic metal. See all 8" DuraBlack Stove Pipe. 8 Inch Stove Pipe Economical, high quality stove pipe (also called connector pipe) used to attach a stove to a chimney. Add to Wish List Add to Compare. Available in 6"-8" Diameters Heavy Gauge Stainless Steel inner Aluminized Steel outer wall Painted black Residential and commercial HVAC vents, flues, pipes and liners for stoves, chimneys, furnaces, and . Our Price: $63.48. Imperial Manufacturing BM0096 8 Inch Black Stove Pipe Collar. 53.02 inc VAT. 8 Inch Selkirk Single Wall Black Stove Pipe. This line is economical, high quailty stove pipe ideal for basic installations. Best Sellers. DCC-90 90-degree Elbow . 8 x 24" 24 gauge black stove pipe $21.25. Free Next Day Delivery Available! Free Store Pickup Today. Fuel Type: Wood. The smaller the gauge, the thicker the metal. This venting lineup includes vent lengths anywhere between 3/4in.-46in. Increaser . 3PVP-KCB-B. Click Here http://tinyurl.com/olptsz5 to see all of our Chimney Pipe. Currency:USD Category:Tools Start Price:1.00 USD Estimated At:NA. The. 6" 24 gauge black 90 stove ell $15.65. 316 Stainless Steel 1mm. 27.93 33.52. Our Price: $62.07. Sell for $25. Manufactured by M&G Duravent, these 8 inch chimney stove pipes are guaranteed to go perfect with your Dura-Tech or Dura-Plus Chimney. Available in both matt black and gloss black finishes from 4 inch to 6 inch diameters, and in matt black finish from 7 inch to 8 inch . DCC-45 45-degree Elbow. IMPERIAL 24-in L x 8-in Dia Black Steel Stove Pipe Item # 37268 Model # BM0365 Shop IMPERIAL 29 +2 Used as a connector between the stove and a listed chimney system or existing masonry chimney Manufactured from 24-gauge black matte pre-painted scratch and chip-resistant steel Requires minimum of 18-in clearance from combustible materials OVERVIEW Quantity . Adjustable lengths eliminate the need for cutting and crimping. Length. This double walled stovepipe from Security helps create a solid connection between your stove and chimney system. This item: 8in x 48in Single Wall Black Stove Pipe $112.99 8" DuraBlack Damper Section - 8DBK-DS $50.50 8in x 38in to 70in Single Wall Black Telescoping Stove Pipe $196.99 Imperial Manufacturing Group BM0222 8 X 48 Black Matte Stove Pipe 31 6 offers from $64.92 Black Stove Pipe 8"x36" 30 1 offer from $40.99 You're Shopping: Sutherlands.com My Cart(0) Login; Register; You're Shopping: Sutherlands.com . 99 (4) 8inX18in Double-Wall Length. Barometric Tee with Damper -24 Gauge. Worldwide Sourcing. Reduce combustible wall clearances down to 6" and combustible ceiling clearances down to 8". The Male end of this pipe fits inside the Salamander Hobbit direct air kit. 8" x 48" Black Matt Stove Pipe - 24ga: BM2027: 6" x 24" Black Matt Stove Pipe c/w Damper Holes - 24ga: BM0343: 3" x 24" Black Matt Stove Pipe - 28ga: BM0344: 4" x 24" Black Matt Stove Pipe - 28ga: View All FAQs & Tips Wood Stove Pipe Components Installation Tips. x 90 deg. Simpson DuraVent Telescoping Stovepipe 6in. . Selkirk 8 in. SOLD 9.00 USD to Mtree + applicable fees & taxes. L Stainless Steel Chimney Pipe. Black Stove Pipe, BM0111-C at Tractor Supply Co. Great Customer Service. Please call ahead to confirm availablity of items marked as Limited Stock. DVL Double-wall interior stovepipe for connecting woodstoves to Stove Pipe Read More 8 Inch (200mm) Matt Black Stove Pipes 8" Matt Black Stove Flue Pipe With Damper Accessories 8" Matt Black Stove Flue Pipe With Damper Write a Review 67.25 inc VAT In Stock QTY Quantity: Free delivery when you spend over 150 Description Dimensions / Specifications 225mm in length and 200mm (8") in diameter with damper. Vitrelux stove pipe is a single wall connecting stove pipe with a high temperature, acid resistant enamel coating. Single wall stove pipe is not intended for use as a chimney - it is a connector pipe only. * Estimated stock levels as of Fri, Jul 15, 2022. Adds 4" - 16" of length to rigid pipe. (33) Only $ 74.99. Ventis Single-Wall Black Stove Pipe 8-Inch Double-Wall Adapter - For 8 Inch Inner Diameter Ventis; Ventis 8-Inch Diameter Double-Wall Black Stove Pipe - 36-Inch Length; Superior 12" Hi-Temp 30-Degree Elbow Pipe - 8" Return; DuraVent 7" Diameter Black DVL Pipe - 18" . ETA October 2022 (Asparagus) Add to cart. Can't Find Your Stove or Fireplace? L Steel Stove Pipe. $59.99 $45.62. Did you win this item? Available in 6" & 8" Diameters Heavy Gauge Stainless Steel inner Galvalume outer wall Air Insulated Black matte finish Double Wall Stove Pipe - DCC | Selkirk Residential and commercial HVAC vents, flues, pipes and liners for stoves, chimneys, furnaces, and other applications. x 24 in. 8" Ocp21180 $50.99 Slip Connector 18" length. QTY. Buy Imperial 6 in. . Matt Black Stove Pipes - 8 Inch (200mm) from Trade Price Flues. 24-Gauge Three stovepipe screws create secure connections between pipes. Find value and selection on Black Pipe and much more at Sutherlands. 6 inch Double Wall Stove Pipe Sections $ 44.63. This black stove pipe is used in the interior portion of the chimney when combustibles are not a concern. Over 30 years of experience in supplying quality products at a reasonable price. Reduces clearances from 18" to 6". 8" DuraBlack Slip Increaser 6"-8". 8 inch Double Wall Stove Pipe Sections $ 224.90. The 6" Diameter Champion Premium Double Wall Black Stove Pipe - 6" is UL/ULC Listed with a 6 inch clearance to walls and an 8 inch clearance to ceilings. DSP is the DIYer's double wall stove pipe used to connect all-fuel burning appliances to a chimney with reduced clearance to combustibles. 4" Damper Unit for Stove Pipe. 99 (8) Imperial Metal Stove Pipe, Black Matte Finish From $16. 99 (4) Imperial Big End No Crimp End Cap, Black Matte Finish From $14. (7) Details. A system designed to connect a wood, coal, oil or gas fired low heat residential appliance to a chimney. Imperial Metal Adjustable Elbow For Fireplaces & Woodstoves, 8-in x x90, Black Matte Finish $21. Advanced Search. 1 Review. Solid Fuel Cowls. The round female end accepts 8" diameter, 22-ga. stovepipe Ocp21376 $80.49 Reducer Easily adapts large stove pipe to smaller stove pipe. Add to Wish List Add to Compare. . Add to cart. 24 is the accepted standard. 6 Double Wall Pipe . Talk to one of our knowledgeable parts staff today: 518-623-4349 VermontCastings.Parts 518-623-4349 . 6XDCC8-BK Increaser. Imperial BM0014 Stove Pipe Adjustable Elbow Single Wall 6" Black. With an invisible seam, finished with high-quality silicone-based black stove paint, it looks as smart as it . Categories . The male oval end is 5 3/8" x 9 3/4", and the round female end will fit 8" diameter, 22-ga. stovepipe. Imperial BM0014 Stove Pipe Adjustable Elbow Single Wall 6" Black. Double Wall piping has a limited lifetime warranty. Quick view . 1 product rating - DuraVent 8DVL-48 DVL Galvanized Steel Double Wall Stove Pipe, 8 x 48 Inch, Black. These high-performance vents also feature a range of materials, including steel, aluminized steel . Material: Stainless Steel. Sellers with highest buyer ratings; Returns, money back; Ships in a . 7" Woodstove Flue Pipe. 5" 316 1mm Stove pipe. Slip Connector - 24 Gauge. Add to Cart. 8 INCH OVAL TO 6 INCH ROUND ADAPTER - BLACK (0001860) Our Price US$72.45. With an invisible seam, finished with high-quality silicone-based black stove paint, it looks as smart as it performs. Threaded Long Pipe Nipple 1 In X60 In Mfg.# BN 1X60-S Sku# 5298161. Why DSP - DSP black stove pipe that provides better insulating value for superior wood stove performance. Double-walled for going through the roof or ceiling. Inner Diameter: 8 inch Clear All Black Stove Tee 2 Variations Available Black Stove Tee Compare Add To List Sku # 6371238 $24.47 each You Save $3.02 each with Mail-In Rebate Shipping CHOOSE VARIATION Black Stove Reducer With Crimp 4 Variations Available Black Stove Reducer With Crimp Compare Add To List Sku # 6371092 $11.12 each Rock-Vent single wall stove pipe is cold rolled 22 gauge, mild steel, rust free, and is perfectly round for a precise pipe to pipe fit.The perfect fit is a result of the use of the latest techniques in laser butt-welding and forming technology. Imperial Manufacturing BM0226 4 Inch 28 Gauge Black Collar. Get the best deals for 8 inch stove pipe at eBay.com. Compare. The stove is a buck and it has a 8 inch outlet on stove. All Chimney; Chimney Liners. Add to Cart. Measure the collar outlet for diameter. 5" Woodstove Flue Pipe. Make a 3 inch thick wall made of bricks against any combustible wall to which you want to pass the stove pipe. Please select a store to view pricing and availability. The AmeriVent Model DCC double - wall stovepipe is designed for use with AmeriVent Model HS/HSS chimney systems. We also carry black stainless steel paint for touch-ups after you complete your installation. Stove Top Drip Free Adaptor - 24 Gauge. Additional Information: For an economical, drip-free, single-wall stovepipe, DuraBlack is an excellent choice. to 6 in., the closest . The collar is the welded circle on top of the stove where the pipe connects. Cleanout Tee - with End Cap - 24 Gauge. Manufactured for optimal system performance, Saf-T Pipe is unmatched in safety, durability and ease of installation. Departments. . Heat-Fab 8-Inch Diameter Welded Black Stove . The double wall construction contains built in insulation, and allows for heat recovery. Simply put, our Single Wall black pipe is a superior product to Dura-vent, Snap-Lock, and all other makers of black stove pipe. Double-Wall Close Clearance Stove Pipe Connector Kit in Black DVL double-wall stovepipe completes the venting DVL double-wall stovepipe completes the venting system when used with one of DuraVent's chimney products, such as DuraTech, DuraPlus or DuraPlus HTC. Trading Standards & Google Shops Certified. (inc VAT) 56.30. Home / Shop / Black Stove Pipe. flue is 13x13. D X 48 in. 8-Inch X 48-Inch Matte Black Stove Pipe Mfg.# BM0222 Sku# 6233308. DuraBlack 8-in Stovepipe This is a high-quality, 24-ga stovepipe. Cowls & Accessories. New, never used. $52.00. Compare. With this stovepipe, you can install your connection with just 6 inches of clearance. 2 Reviews. and vent heights anywhere between 63/1000in.-60in. Saf-T Pipe is made from 22-gauge cold-rolled steel, which is up to 60% thicker than snap-lock single wall stove pipes. DVL's double-wall, air-insulated design reduces clearances to combustibles from 18 in. $59.99 $48.53 . 4.3. Have 12 inches of space between the combustible and brick walls. Format 6". DuraVent DVL Galvanized Steel Double Wall Stove Pipe, 6 x 6 Inch, Black. Original cost about $80. 10" DuraBlack Double Skirted Stovetop Adapter. Imperial 6 in. 36.75 44.10. Step 4 - Install the Stove Pipe. Ships Within 2 to 3 Business Days | Flat Rate Shipping. Add to Cart Compare Quick view. For example, if the pipe's diameter is 8 inches then the clearance should be 24 inches. back Chimney. WHAT IS STOVEPIPE? 6" 316 1mm Stove pipe. SELKIRK. Installation Instructions. 8-Inch Durablack ID 38119 Suggested Retail $1,157.21 Your Low Price $925.74 Free Shipping Required Fields * Durablack Single Wall Black Stove Pipe 1 x Slip Connector w/Trim (Ships in 2-3 Weeks) + $64.04 1 x Snap-Lock Adapter w/Trim (Ships in 2-3 Weeks) + $98.99 1 x 12-Inch Length Single-Wall Black Pipe (Ships in 2-3 Weeks) + $36.65 8 " Ocp77555 $83.49 Stove Adaptor May be required to adapt some stove flue outlets to >Double</b> Wall Stove Pipe. 8 Inch Selkirk Single Wall Black Stove Pipe. You can crimped the other end using our crimping tool. 6inX24in Double-Wall Length. Talk to one of our knowledgeable parts staff today: 518-623-4349 VermontCastings.Parts . The Black Pipe has a Stainless Steel inner liner. Add to Cart Compare . All items subject to prior sale. Heat-Fab 8" Stove Pipe Offset Oval to Round Adapter. Double Wall Black Telescoping Stove Pipe Rating:. 3 Single Wall - 20 Length. Black Stovepipe. The product is painted black to match the appliances. Double Wall / Stove Pipe Components - Double Wall / 8 inch Double Wall Stove Pipe Components. $9.59 $11.69. Shop our 6 inch and 8 inch Black Stove Pipe by Heat-Fab at ventingpipe.com. 8-INCH BLACK STOVE PIPE; 4-24 INCH 24GA; 4-8 INCH 24GA. ComfortBilt 3 inch Pellet Stove Piping Kit - Black Matte /No Elbow. 15.5-in L x 6-in Dia Black Steel Stove Pipe Model # 206242 Find My Store for pricing and availability Keep Your Home Warm and Safe With a Stove Pipe Scratch-resistant corrosion-proof stove pipes can be both distinguished and ultimately useful. About 3 ft long. Selkirk DSP6P36-1 Double Wall Smoke/Stove Pipe, 6" x 36" Add. Model # DSP8TL Store SKU # 1001210612. 36.75 44.10. $85.37. This pipe is most commonly used as the vertical section from the top of the Wood Stove. Pilot Rock Steel Fire Ring with Cooking Grate 24in. . Metal-Fab Black Pipe Section 8" x 48" Single Wall - 8SW48 The perfect companion to Metal-Fab's 2100 degree Temp Guard pipe, black stovepipe provides a connection, in open space, between the stove and the Temp Guard chimney. 1 Review. 8 Black Stove Pipe; 6 Black Pipe Components; 7 Black Pipe Components; 8 Black Pipe Components; Double Wall Pipe & Components. Features an exclusive Thermal Web design to create a free airflow that . DVL 6 in. . Heat-Fab 8-Inch Diameter Welded Black Stove . $6.89 $8.39. Venting is critical for the safe use of heaters, stoves and fireplaces, and Northern Tool's got you covered. Round End Cap - Small End - No Crimp - 24 Gauge. 8 Inch DuraBlack Collection. D X 36 in. Free Store Pickup Today. 1 Review. Round End Cap - Large End - No Crimp - 24 Gauge. Product Features 24 Gauge Used to Connect Wood Stove to Chimney Single Wall Imperial Mfg Black Stove Pipe 8 inch X 24 inch 24 Gauge JavaScript seems to be disabled in your browser. Built to Simpson DuraVent's high standards, DuraBlack is constructed with die-formed end fittings. Stove Pipe Plus - Matt Black. How long does the flex pipe last ? Metal-Fab's black stove pipe is tested to UL standard 103. $22.99. STOVE PIPE: 8 INCH OVAL TO 6 INCH ROUND ADAPTER - BLACK (0001860) Our Price US$72.45. $59.99 $47.71. We have a great online selection at the lowest prices with Fast & Free shipping on many items! There is one tiny spot of rust on the inner wall but it's not through the metal. This Telescopic Double Wall Stove Pipe Length adjusts from 38 inches to 68 inches long and has a 8 inch inner diameter. Pipe Inside Diameter: 8. Categories . Code . Offered in 6" and 8" diameters. 8 Inch Ventis Pipe; 8 Inch Ventis Pipe 316L; Chimney. This product comes in single wall or double wall construction. Model: 2608B. 8" Wall Bracket Black Stove Pipe. Metal-Fab Black Pipe Telescoping Length 8" x 66" Double Wall - 8DWBTL66 The perfect companion to Metal-Fab's 2100 degree Temp Guard pipe, black stovepipe provides a connection, in open space, between the stove and the Temp Guard chimney. All Chimney Liners; Chimney Liner Insulation; Direct Vent Co Linear Liner Kits; . Home > Shop > View Product By Type > Fireplace and Stove Venting > Wood Stove Connector Pipe > 8 inch Single Wall Stove Pipe Use our 24 ga. single wall black stove pipe to connect wood burning appliances to chimneys. Assembled Tee - 24 Gauge. Premium Vitreous Prefabricated Single Wall Wood Stove Pipe System Suitable for Gas, Oil and Solid Fuel (Woodstove) . A regular 8" pipe is simply squished to an oval shape to fit that - this stove was a mistake, sell it, buy one with a 6" flue - upsizing the chimney will cost you more than a new used stove that fits your chimney, and reducing the flue does not work (and violates fire codes.) Insert the adapter or Conne. Add. 3/8 x 60-Inch Black Pipe Nipple Mfg.# BN 3/8X60-S Sku# 5298120. Showing 1-18 of 27 results $ 175.65. Add to Wish List Add to . Black Stove Pipe ell. SKU: 3"SW20" Category: 3" FLUE PARTS Tags: Asparagus - Parts Backorder 10/22 ETA, Broccoli - Parts Backorder - ETA 12/22. (7") stove collar and want to connect to a piece of 200mm(8") stove pipe. Designed with a 1/4" air space between double-wall construction to reduce moisture and smoking, increase wood stove efficiency and produce less creosote. 4" Woodstove Flue Pipe. Heat Fab stove pipe is high quality, economical and is especially compatible with other Heat Fab stove pipe and venting products. The spigot is 6mm less than the nominal diameter. Top Rated Plus. 6in Cast-Iron Stovepipe Damper. Advanced Search. Buy Now . Home; Skip to main content. 8 inch Premium Vitreous Enamelled Woodstove Pipe: Fast Delivery, Direct From Manufacturer. Please note: All of the Black 7 inch Single Wall Stove Pipe on this page is 24 gauge. 6" Woodstove Flue Pipe. Install your stove pipe. Adapter used to connect single wall flue pipe to your boiler if required. Black Stove Pipe Elbow, BM0016-C at Tractor Supply Co. Great Customer Service. 6 x 24" 24 gauge black stove pipe $15.95. Joe shows you how to install DuraTech DuraBlack Stove Pipe. Metal-Fab's black stove pipe is tested to UL standard 103. Straight Pipe is entirely self-locking. Availability: Sold out, but more on the way! 8'' x 48'' DuraBlack Single-Wall Black Stove Pipe - 8DBK-48 $63.04 As low as: $56.74 8'' x 24'' DuraBlack Single-Wall Black Stove Pipe - 8DBK-24 $38.68 8'' x 12'' DuraBlack Single-Wall Black Stove Pipe - 8DBK-12 $30.54 8'' DuraBlack Damper Section - 8DBK-DS $62.36 #8 1/2'' Self-Drilling Black Screws Pack of 20 $2.90 Model DCC is UL-listed for a minimum airspace clearance to combustibles of 6" to the. Diameter, Black, Model# 810000959. Our Double Wall Black Stove Pipe is manufactured with our substantial 24 gauge black steel outer pipe and 430 stainless steel inner liner. Prices may vary between stores and online. Add to Cart. See All Product Details. Double Wall Black Stove Pipe Rating: 4 Reviews As low as $67.99 Use Black Double Wall Stove Pipe when you need to reduce clearances to combustibles. Overall length is 12", the part that inserts into the chimney is 8 " long. The unique design of this pipe and backed by a lifetime warranty make this the most superior pip. Which is best 304 or 316ti? DuraVent 8" Inner Diameter - DuraBlack Stove Pipe - Single Wall - 48" Pipe Length. Duravent 8-Inch Diameter DVL Double-Wall Black Stove Pipe And Components By DuraVent Model 8-Inch DVL ID 38085 Availability: Ships in 2-3 Weeks Suggested Retail $70.43 Your Low Price $56.34 Free Shipping Required Fields * 8- Inch Chimney Components 1 x Double Wall Black Pipe- DVL/DuraBlack Chimney Adapter/with trim (Ships in 2-3 Weeks) + $96.61 current price $22.99. Are you a Pro? Code 1945. This is commonly called "connector pipe". 8 inch Double Wall Stove Pipe . 46.92. Manufactured from 1.0mm zero carbon steel from size 5 inch to 8 inch and 0.9mm in 4 inch only. **Single wall stove pipe or any "stovepipe" is intended for interior use between the appliance and the wall or ceiling only. 8" Woodstove Flue Pipe. Learn more. Single wall stovepipe is designed with 18" clearance to . x 60 in. Boiler adapter single wall 200mm (8 inch) quickview. Comes with one end crimpped. which would you use installing as a insert in a fireplace with flueliners? an 8" pipe has a cross-sectional area of 50 square inches - a 6 inch only 28 square inches (geometry - Pi * R-squared .