Q:

What is the CFM formula for HVAC?

A:

The formula used to determine the amount of CFM, or cubic feet per minute, a room needs for heating begins by multiplying the room's volume by the number of times the heated air gets changed hourly. Then divide the resulting number by 60 to produce the amount of CFM required.

To determine the room's volume for the first step in the formula, the room's length, width and height must be multiplied together. When this volume is multiplied by the hourly air changes, the resulting number is the amount of cubic feet of air that passes through that room hourly. The cubic feet is then divided by 60 in the final step, since there are 60 minutes in an hour. The resulting CFM refers to how many cubic feet of air must be fed into that room every minute.


Is this answer helpful?

Similar Questions

  • Q:

    What is an HVAC gas pack?

    A:

    An HVAC gas pack is a heating and cooling system with the heat pump and the air conditioner housed together in a single unit. HVAC gas packs use propane, natural gas or oil for heating purposes, and for cooling purposes, it uses electricity.

    Full Answer >
    Filed Under:
  • Q:

    How do I install a room thermostat?

    A:

    To install a thermostat, first remove the cover plate, then turn off the power to the heating and cooling system. Remove the old thermostat by unscrewing the mounting bolts and label the wires with tape for identification later. Install the new thermostat by connecting the low-voltage wires and attaching the screws. Install batteries, if applicable, and restore power to the heating and cooling system.

    Full Answer >
    Filed Under:
  • Q:

    Why does the cfm per ton of air conditioning vary?

    A:

    The cubic foot per minute, or cfm, per ton of air conditioning varies depending on application. Approximately 400 cfm is required for normal use, while 500 cfm is needed for high sensible heat situations. High latent heat loads use 350 cfm. Sensible heat directly affects the temperature of the room, while latent heat does not affect temperature because it causes a change in state.

    Full Answer >
    Filed Under:
  • Q:

    What is needed to convert CFM to BTU to determine HVAC system size?

    A:

    The formula for calculating BTU loss or gain in converting CFM to BTU is temperature difference times actual CFM leakage times 1.08 equals BTU loss or gain. CFM is the actual cubic feet of air volume per minute pushed through the HVAC unit. BTU is the British thermal unit of heat removed from the room by the HVAC unit.

    Full Answer >
    Filed Under:

Explore