HVAC Site - Professional HVAC Contractors Forum banner
1 - 3 of 3 Posts

2 Posts
Discussion Starter · #1 · (Edited)
Hi , Everyone

i am little confused regarding the Total Fresh air fain coil unit and Mix air unit

1) as you can see below that the 4TR unit is a total fresh air unit , providing the total of 740 CFM , but its a 4TR unit which means 4TRx400CFM = 1600 CFM , why the capacity is only 740 CFM ,

2) how do we calculate the required Fresh for a certain space ?

3) lets say i have a 5TR unit in a corridor means 2000 CFM capacity i will provide 1750 CFm to the corridor and remaining 250 to the rooms as a fresh air 50 cfm per room . so how much cfm of fresh air i have to provide from outside ??

please feed me with comments thank you so much


Please check the picture you will understand better
1 - 3 of 3 Posts