## 400 CFM per Ton

## 400 CFM per Ton

(OP)

A rule of thumb in air conditioning work is that 400 cfm of air is equal to 1 ton. If 400 cfm of air and a delta T of 20 degrees is achieved, this is equal to only 400X20X1.08=8640 btu/h.. This is not 12000 btu's. What am I missing here besides a college education.

## RE: 400 CFM per Ton

## RE: 400 CFM per Ton

Q = 4.5 x cfm x Delta h

to get total heat

HVAC68

## RE: 400 CFM per Ton

Thank you, this really helps.

## RE: 400 CFM per Ton

HVAC68

## RE: 400 CFM per Ton

The factor 1.08 reflects only sensible heat and is the product of

^{o}F)which when multiplied by X CFM results in

## RE: 400 CFM per Ton

Hileg

## RE: 400 CFM per Ton

A small correction to my last paragraph, it should say: when multiplied by X (CFM) * ΔT (

^{o}F) results in