combustion air calculator

1
. Calculating Room Size Length Width Height 25 40 8 8000 Insert Numbers Then Hit "Enter" Key Enter Btu's 140,000 7000 -1000 COMBUSTION AIR FROM INSIDE OF BUILDING Using Wooden Grill Square Inches Needed 186.666667 Square Inches Needed 560 Size of Metal Grill needed 13.662601 BY 13.662601 23.6643191 BY 23.664319 12" x 12" minimum size gril 20" x 20 " minimum size grill Obtaining Outside Combustion Air BTU'S 140,000 35 Hole Size 35 Grill Size 46.666667 see chart below 5.91607978 BY 5.9160798 6.83130051 BY 6.8313005 Square Inches of Horizontal Ducts 62.222222 93.3333333 Opening Size 7.8881 BY 7.8881064 Duct Size 9.66091783 BY 9.6609178 . Total Square Inches Required Total Square Inches Required 0 thru 7 3" 132.8 thru 153.9 14" 7.1 thru 12.5 4" 154 thru 176.7 15" 12.6 thru 19.6 5" 176.8 thru 201 16" 19.7 thru 28.2 6" 201.1 thru 226.9 17" 28.3 thru 38.5 7" 227 thru 254.4 18" 38.6 thru 50.3 8" 254.5 thru 283.5 19" 50.4 thru 63.6 9" 283.6 thru 314.1 20" 63.7 thru 78.5 10" 314.2 thru 346.3 21" 78.6 thru 95 11" 346.4 thru 380.1 22" 95.1 thru 113 12" 380.2 thru 415.4 23" 113.1 thru 132.7 13" 415..5 thru 452.3 24" . Total cu. ft. In room READ ALL INSTRUCTIONS Total cu. ft. needed cu. ft. needed Calculation of square inches of Grill Size 1 square inch for every 2000 BTU's Size of Wooden Grill Needed Size of Vertical Round Pipe Size without Grill (one 12" of top & one 12" of bottom) Hole Only ----- Sq. Inches of Hole Needed in ceiling and floor or wall Without a Grill 12" of top and one 12" of bottom- Air Openings shall not be less than 3 inches When Using Metal Grill- Size Needed - (one 12" of top & one 12" of bottom) Sq. Inches Needed Sq. Inches Needed Sq. Inches Needed 1 square inch per 3000 BTU's (1" clearance on Sides & Back & 6" on Front of appliances) 1 square inch per 2000 BTU's Ducts to be Installed Top & Bottom with Metal Grill Sq. Inches Needed Sq. Inches Needed Round Pipe Chart without a grill Round Pipe Size Round Pipe Size

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Calculation air for Combustion

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Combustion Air Calculator

Sheet1.Calculating Room SizeTotal cu. ft. In roomLengthWidthHeightREAD ALL INSTRUCTIONS254088000Insert Numbers Then Hit "Enter" KeyEnter Btu'sTotal cu. ft. neededAdditional cu. ft. needed140,0007000-1000COMBUSTION AIR FROM INSIDE OF BUILDINGCalculation of square inches of Grill Size 1 square inch for every 2000 BTU'sUsing Metal GrillUsing Wooden GrillSquare Inches Needed186.6666666667Square Inches Needed560Size of Metal Grill needed13.6626010213BY13.6626010213Size of Wooden Grill Needed23.6643191324BY23.664319132412" x 12" minimum size grill20" x 20 " minimum size grillObtaining Outside Combustion AirBTU'SSize of Vertical Round Pipe Size without Grill (one 12" of top & one 12" of bottom)Hole Only ----- Sq. Inches of Hole Needed in ceiling and floor or wall Without a Grill 12" of top and one 12" of bottom- Air Openings shall not be less than 3 inchesWhen Using Metal Grill- Size Needed - (one 12" of top & one 12" of bottom)140,000Sq. Inches Needed35Hole SizeSq. Inches Needed35Grill SizeSq. Inches Needed46.6666666667see chart below5.9160797831BY5.91607978316.8313005106BY6.8313005106Obtaining Combustion Air From Outside the BuildingOne Permanent Opening InstallationSquare Inches of Horizontal Ducts1 square inch per 3000 BTU's (1" clearance on Sides & Back & 6" on Front of appliances)1 square inch per 2000 BTU's Ducts to be Installed Top & Bottom with Metal GrillSq. Inches Needed62.2222222222Sq. Inches Needed93.3333333333Opening Size7.8881BY7.8881063775Duct Size9.6609178308BY9.6609178308Round Pipe Chart without a grill.Total Square Inches RequiredRound Pipe SizeTotal Square Inches RequiredRound Pipe Size0thru73"132.8thru153.914"7.1thru12.54"154thru176.715"12.6thru19.65"176.8thru20116"19.7thru28.26"201.1thru226.917"28.3thru38.57"227thru254.418"38.6thru50.38"254.5thru283.519"50.4thru63.69"283.6thru314.120"63.7thru78.510"314.2thru346.321"78.6thru9511"346.4thru380.122"95.1thru11312"380.2thru415.423"113.1thru132.713"415..5thru452.324".