HEATING ENERGY CALCULATORS AIR CONDITIONING AIR QUALITY
 
   
 
Air Conditioning
13 SEER Air Conditioning Efficiency
Add Central Air Conditioning
Additions & Remodels
Air Filters
Air Handlers
Air Purifiers
Air To Air Exchangers
Central Air Conditioning
Condensers
Controls
Cooling Coils
Dehumidification
Ductless Mini-Split
Ductwork & Distribution
Duct Design and Dynamics
Efficiencies
Electronic Air Cleaner
Energy Conservation
Energy Conservation Calculators
Energy Savers
Fuel Cells
Geothermal Furnace
Heat Gain
Heat Pumps
Hydro-Air
Maintenance Tips
Motorized Dampers
Portable Air Conditioners
Problem Areas
Programmable Thermostats
Refrigeration Cycle
Return System
Self Contained
Solar Cooling
System Design
Troubleshooting Tips
Window Air Conditioner
Wine Cellars
Zoning
 
HEATING
Add On Wood Furnace
Additions & Remodels
Air Filters
Air Purifiers
Air To Air Exchangers
Aquastats
Attic Insulation Calculator
Boilers
Bypass Humidifier
Chimneys & Power Ventors
Controls
Corn Furnaces
Ductless Mini-Split
Ductwork & Distribution
Duct Design and Dynamics
Efficiencies
Electric Furnaces
Electronic Air Cleaner
Energy Conservation
Energy Conservation Calculators
Energy Savers
Forced Warm Air
Fuel Cells
Fuel Cost Calculator
Gas Furnaces
Gas Furnace Ratings
Geothermal Furnace
Heat Loss
Heat Pumps
Humidification
Hydro-Air
Hydronic Heating Systems
Insulation
Maintenance Tips
Motorized Dampers
Oil Burners
Oil Furnaces
Oil Furnace Ratings
Portable Furnace
Problem Areas
Programmable Thermostats
Radiant Heat
Replacements
Return System
Self Contained
Solar Heating
System Design
Thermostat Savings Calculator
Troubleshooting Tips
Waste Oil Furnace
Window Replacement Calculator
Wood Boiler
Wood Furnaces
Zoning
 
Heating Topics and Tools Air Conditioning Topics and Tools
Duct Design and Dynamics
 

There are several common numerical factors in home construction. "Sixteen inch on center" refers to the distance between wall studs and floor joists. One quarter inch per foot represents the pitch of a drain pipe. One hundred CFM, cubic feet per minute, is the basis for duct design.

For heating with a gas or oil furnace, 100 CFM represents approximately 8000 BTU per hour.

For air conditioning, 100 CFM represents 6000 BTU.

The standard eight inch deep duct is designed around this 100 CFM standard. Every two inches of width equals 100 CFM. A six inch round duct also equals 100 CFM. So for every two inches of width of an eight inch trunkline equals a six inch round.

Begin with two inches of duct width for friction loss, and the formula for 1000 CFM will be 2 + (2x10)=22 for an 8 inch by 22 inch duct which will supply ten six inch rounds.

Before the ducts can be designed, the size of the furnace and/or air conditioner must be determined. The above 1000 CFM would match an 85000 BTU oil or gas furnace with 30,000 BTU of air conditioning, also referd to as 2 1/2 tons; a ton being 12000 BTU of cooling. The 8 by 22 duct would feed 10 six inch round outlets.

What goes out must come back, so the return system must be the equivalent. Returns are usually fewer in number and of larger diameter but must equal 1000 CFM total.

 
 
 
Energy Conservation Calculators
Attic Insulation Calculator
To calculate energy savings with increased insulation
 
Clean Air Delivery Rate (CADR) Calculator
Estimate the proper size Air Purifier for your room
 
Fuel Comparison
To compare heating costs using various fuels
 
Mini-Split Estimator
Find out the right size mini-split for you
 
Thermostat Set-back
To calculate fuel savings by adjusting your thermostat settings
 
Air Conditioner Efficiency
Calculate energy savings with higher SEER ratings
 
Computer Room Air Conditioner
Size an air conditioner for your computer room
 
Window Air Conditioner Estimator
To size a room air conditioner
 
Window Upgrade
To calculate energy savings with various window replacements
 
Heatload.com
To size an Air Conditioner or Furnace for a house
 
Bypass Humidifier
Approximate your humidifier size requirements
 
Air Exchanger Sizing Calculator
Properly size an Air Exchanger for your home.
 
           
     
HEATING ENERGY CALCULATORS AIR CONDITIONING AIR QUALITY HOME
   
           
     

Copyright ©2010 Warmair.com Inc. Use of this website constitutes acceptance of Warmair.net User Agreement. "Online Comfort" and "Conditioning the Internet" are service marks of Warmair.com Inc. All Rights Reserved.