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COMBUSTION AIR CALCULATION SHEET BLOCK LOT QUALIFICATION CODE PERMIT # WORK SITE ADDRESS (Street) (City) (Zip) Owner in Fee Tel. ( ) (ALL BTU RATINGS LISTED BELOW MUST BE INPUT RATING) Furnace BTUS.

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The volume of the space must equal 50 ft3 per 1000 BTU/hr. in addition to the infiltration air requirements. If the volume of the space is sufficient and the infiltration air is acceptable, then the indoor air method for calculating combustion air can be utilized.

Furnace btu's + Water heater btu's + dryer btu's = Total btu's 80,000 + 35,000 + 27,000 = 142,000 btu's 142,000 BTU x 50 / 1,000 = 7,100 cubic feet required Room size of: 1000 SF x 6.5 feet high = 6,500 cubic feet ---insufficient combustion air.

In this example we'll say that the furnace has an input rating of 80,000 BTU/hr and the water heater has an input rating of 40,000 BTU/hr. So the combined input rating is 120 when measured in 1,000 BTU/hr. So the room needs to have a volume of 120 x 50, or at least 6,000 ft3.

The International Fuel Gas Code requires the following combustion air openings for a boiler room: Vertical opening. One-inch free area for each 4,000 Btu/hr. ... Horizontal duct opening. One-inch free area for each 2,000 Btu/hr. ... Mechanical fan. One CFM of air for each 2,400 Btu/hr. ... Indoor air. 50 cu.

Where all combustion air and dilution air is provided by a mechanical forced-air system, the combustion air and dilution air shall be supplied at the minimum rate of 1 cfm per 2,400 Btu/h [0.00067 m3/(s • kW)] of combined input rating of all the fuel-burning appliances served.

To burn 1 cubic foot of gas, approximately 1,000 Btu for natural gas, requires 10 cubic feet of air for perfect combustion (Figure 2).

Combustion air from outside the dwelling 1) Direct opening to outside requires one square inch per 4000 BTU's (no duct). 2) Opening via horizontal duct requires one square inch per 2000 BTU's. 3) Opening via vertical duct requires one square inch per 4000 BTU's.

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Form Packages
Adoption
Bankruptcy
Contractors
Divorce
Home Sales
Employment
Identity Theft
Incorporation
Landlord Tenant
Living Trust
Name Change
Personal Planning
Small Business
Wills & Estates
Packages A-Z
Form Categories
Affidavits
Bankruptcy
Bill of Sale
Corporate - LLC
Divorce
Employment
Identity Theft
Internet Technology
Landlord Tenant
Living Wills
Name Change
Power of Attorney
Real Estate
Small Estates
Wills
All Forms
Forms A-Z
Form Library
Customer Service
Terms of Service
DMCA Policy
About Us
Blog
Affiliates
Contact Us
Privacy Notice
Delete My Account
Site Map
All Forms
Search all Forms
Industries
Forms in Spanish
Localized Forms
Legal Guides
Real Estate Handbook
All Guides
Prepared for You
Notarize
Incorporation services
Our Customers
For Consumers
For Small Business
For Attorneys
Our Sites
US Legal Forms
USLegal
FormsPass
pdfFiller
signNow
airSlate workflows
DocHub
Instapage
Social Media
Call us now toll free:
1-877-389-0141
As seen in:
  • USA Today logo picture
  • CBC News logo picture
  • LA Times logo picture
  • The Washington Post logo picture
  • AP logo picture
  • Forbes logo picture
© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232