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Old 02-12-2013, 02:39 PM   #1
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Interior door clearance...


What gap is typical for adequate air flow? I need to trim down a few interior doors. The first two are 36" wide for 100sf or so bedrooms with no individual returns. The master has double doors measuring 60" total with a return in the room. There is one large return in the hall near the two bedrooms. I'm thinking 3/8" for the small bedrooms and 1/8" for the master. Please let me know if this works. I want the heat pump to work as efficiently as possible.

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Old 02-12-2013, 02:44 PM   #2
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Interior door clearance...


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Originally Posted by MisterSteve View Post
What ? I need to trim down a few interior doors. The first two are 36" wide for 100sf or so bedrooms with no individual returns. The master has double doors measuring 60" total with a return in the room. There is one large return in the hall near the two bedrooms. I'm thinking 3/8" for the small bedrooms and 1/8" for the master. Please let me know if this works. I want the heat pump to work as efficiently as possible.
I am sure an HVAC Expert will correct me, but I don't think there is such think as a door gap is typical for adequate air flow!

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Old 02-12-2013, 02:54 PM   #3
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Interior door clearance...


the average interior door depending on what flooring and who set it has around an inch under it. for years they have been requiring cold air returns in bedrooms.
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Old 02-12-2013, 03:55 PM   #4
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Interior door clearance...


its all in the math... first you have to know what the supplied air flow to the room is. Then you can calculate the needed exit area under the door (h x w).... but I think just about everyone here will agree that normally you would have to under cut the door by about 2 to 3 or more inches for the air flow math to work out correctly.

The alternatives are:

1. install return ductwork in each room.
2. Install transfer ducts (sometimes called jump ducts) from each room to open main areas (your hall way if I read correctly)
3. install a grill in each door, of the size needed for the airflow into the room.

From experiance on my home, transfer ducts made a huge difference!!!!! kids sleep with their doors closed and putting in the transfer ducts keeps the rooms at the same temp as the rest of the house and the hvac system is much more efficent, which has more then paid for the diy cost of the installation!!!! The ducts basically allow the air from the "sealed" off rooms to get back to the air handler. again, a huge difference in comfort and economy !!!!
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Old 02-12-2013, 04:01 PM   #5
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Interior door clearance...


I try to have a min. of 1/2. problum is if you have cheap hollow core door there's not much wood on the bottom.
Cut to much and your stuck having to dig out the old strip and glue it up inside the door.
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