17Mar/09Off
Bend Size
I need help determining the return air duct size for my furnace.?
my furnace is a gas ,75,000 btu goodman.I just need to know the minimum duct size to use for the return air. Is there an easy answer or is there an equation to use to figure it out.the duct only needs to be 9ft. long with two 45 deg. bends.
8x24 will do.Some one is going to come in and say that an 8x 22 will be enough but it is 74,100 BTU's.On an older furnace you could have gotten away with this but the newer furnaces are built with the thinest metal they can get away with and they need good air flow to keep the heat exchanger from cracking.
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South Bend 12 size Model 429 19J Adj 4 P Double Roller Runs Excellent $75.00 |
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VINTAGE WEST BEND LARGE ALUMINUM COOKIE CANISTER PINK TONE WHITE TOP 2 GALLON SZ $3.95 |
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Ridgid 36132 Red 408 400 Series Lever Bender. Capacity Tube Size 1/2" Bend $98.43 |
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MOONLIGHT DUNELAND SOUTH SHORE CHICAGO BEND REPR POSTER $39.20 |
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MOONLIGHT DUNELAND SOUTH SHORE CHICAGO BEND REPR POSTER $15.80 |
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MOONLIGHT DUNELAND SOUTH SHORE CHICAGO BEND REPR POSTER $38.00 |
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MOONLIGHT DUNELAND SOUTH SHORE CHICAGO BEND REPR POSTER $55.84 |
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MOONLIGHT DUNELAND SOUTH SHORE CHICAGO BEND REPR POSTER $21.44 |
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MOONLIGHT DUNELAND SOUTH SHORE CHICAGO BEND REPR POSTER $11.88 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $15.80 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $21.44 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $11.88 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $38.00 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $55.84 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $7.92 |
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SPRING TIME DUCK SOUTH SHORE CHICAGO BEND REPRO POSTER $39.20 |
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Black Men's VESPA T Shirt Bend Euro Moto Logo on Back Size SMALL $9.99 |
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Black Men's VESPA T Shirt Bend Euro Moto Logo on Back Size MEDIUM $9.99 |
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Black Men's VESPA T Shirt Bend Euro Moto Logo on Back Size LARGE $9.99 |
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Black Men's VESPA Hoody Hoodie Bend Euro Moto Logo on Back Size LARGE $9.99 |
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Womens Bend Over Blue size 14 pants / slacks $3.00 |
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LEVI STRAUSS BEND OVER SLACKS SIZE 6 $6.99 |
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LEVI STRAUSS BEND OVER SLACKS SIZE 6 $6.99 |
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LEVI STRAUSS BEND OVER SLACKS SIZE 8 $6.99 |
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LEVI STRAUSS BEND OVER SLACKS SIZE 8 $6.99 |
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MAXTORQUE CLUTCH DRUM #35 CHAIN 2 CYCLE DRUM WEST BEND 5/8" SHAFT SIZE $25.00 |
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50 Premium VMC Cone Cut Black Nickel Treble Hooks Size # 2 Round Bend $15.50 |
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100 Premium VMC Cone Cut Black Nickel Treble Hooks Size # 2 Round Bend $26.50 |
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100 Premium VMC Cone Cut Black Nickel Treble Hooks Size # 6 Round Bend $26.50 |
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50 Premium VMC Cone Cut Black Nickel Treble Hooks Size # 6 Round Bend $15.50 |
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Vintage 14 k white gold half dome bend, size 11 3/4 $334.00 |
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Women's Erika Brown Linen Bend Capri Pants w/ Paisley/Flower Patterns Size LARGE $12.99 |
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New Big Bend 925 Sterling Silver ring Size n From Sydney 34312'N $63.31 |
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1 Pair 6 in 1 Fishing Barb Beak Bend Fishhooks Size 10 $3.28 |
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Womans Navy Blue Buttonless Vest Size Medium Bend Over NEW w/Tags $8.99 |
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Vintage Euramerican punk Black full crystal Claw Bend Fingernail Ring Size 11mm $2.25 |
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EAGLE CLAW L095JB Z-BEND WORM HOOK SIZE 1 25 PACK $2.99 |
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EAGLE CLAW L095JB Z-BEND WORM HOOK SIZE 3/0 25 PACK $3.99 |
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"BEND OVER" WOMAN'S BURGUNDY STRETCH SLACKS MISS SZ 10 (32) POLYESTER NEW NO TAG $9.99 |
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Ridgid 36097 406 400 Series Instrument Bender. Capacity Tube Size 3/8" Bend $57.90 |
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Ridgid 36122 404 400 Series Instrument Bender. Capacity Tube Size 1/4" Bend $53.55 |
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New South Bend 150 Swivels Three 50-paks of size 14 $8.99 |
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LEVI STRAUSS BEND OVER LADIES SLACKS - SIZE 8 - $2.00 |
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bend over dress pants sz 36 5X/6X plus sized nwt 2 pair beige fuschia purple $19.99 |
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Indiana Univ South Bend 05 Homecoming T-Shirt Sz XL $5.00 |
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Levi Bend Over Pull-On Pants Dark Pink Sz 10 Average - NWT $18.99 |
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NWT Womens Columbia South Bend II Shorts Apricot Size Small $9.99 |
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12MM TUNGSTEN MENS RING BLACK INLAY PIPE WEDDING BEND TITANIUM COLOR SIZE 6-15 $49.99 |
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South Bend Model 341 18 size pocket watch. $39.00 |
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South Bend Model 407 12 size pocket watch. $19.99 |
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South Bend Model 219 16 size pocket watch. $41.00 |
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A BEND IN THE ROAD BY NICHOLAS SPARKS - 2001 LARGE PRINT LG SC (TRADEBACK SIZE) $2.75 |
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BEND OVER PANTS SZ 8P YELLOW NWT $9.99 |
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Pair Bundle Fishhooks 6 in 1 Design Bend Bait Hook Sz 9 $4.05 |
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*T-Shirt Womens New Sz SM DESCHUTES BREWERY BEND OREGON Home Mirror Pond PaleAle $13.00 |
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*T-Shirt Womens New Sz SM DESCHUTES BREWERY BEND OREGON~TWILIGHT SUMMER ALE logo $14.00 |
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*T-Shirt Womens New Sz M~ DESCHUTES BREWERY BEND OREGON~TWILIGHT SUMMER ALE logo $14.00 |
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TUNGSTEN WEDDING BEND WOMENS & MENS RINGS TITANIUM COLOR SIZE 6-13 $44.99 |
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HANOI ROCKS UP AROUND THE BEND LARGE POSTER-SIZE ADVERT $19.99 |
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r9057 Size 6.5 Engagemet Rectangle Bend Diamante Gemstone Ring Jewelry Fashion $0.65 |
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VINTAGE SOUTH BEND 17.J SIZE 12 CARVED 14K G.F CASE POCKET WATCH 1928 $49.99 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $55.84 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $7.92 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $21.44 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $11.88 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $39.20 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $15.80 |
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WINTER DUNES SOUTH SHORE TRAIN CHICAGO BEND REPR POSTER $38.00 |
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r8977 Size 6.5 Lady's Black Bend Oval Diamante Gemstone Ring CZ Jewelry Fashion $0.01 |
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r8978 Size 8 Engagemet Black Bend Oval Diamante Gemstone Ring Jewelry Fashion $0.01 |
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r8979 Size 9 Engagemet Black Bend Oval Diamante Gemstone Ring Jewelry Fashion $0.01 |
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r9057 Size 6.5 Engagemet Rectangle Bend Diamante Gemstone Ring Jewelry Fashion $0.01 |
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r9058 Size 8 Lady's Rectangle Bend Diamante Gemstone Ring CZ Jewelry Fashion $0.01 |
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r9059 Size 9 Engagemet Rectangle Bend Diamante Gemstone Ring Jewelry Fashion $0.01 |
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PETITE BEND OVER PANTS TROUSERS SLACKS SZ 10 PETITE PASTEL BLUE NWT $19.95 |