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01-17-2018 06:31 PM  8 months agoPost 1
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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I have a typical, suburban "ranch style" (single story) house with a new HVAC system installed.

The problem is that when the HVAC kicks in (heating or AC), the master bedroom door will slam shut.
This only happens if the door is less than 4" or 5" open - if it is open wider, it will not slam shut.

Until I figure this out, I placed a small rag in the door jam to keep the door from slamming.
Leaving the door open at night is becoming less and less of an option.

I think I know why this is happening:
There are 3 vents in this master bedroom area (bedroom, master bath and vanity) for a total of 195in² vent outlet area.

The hallway has two return registers (one at each end of the hallway with the thermostat mounted on the wall 1/2 way between them).
Each return is 20"x20" (each using 20" ducts) for a total return of 800in² for the house.

The only return path from the master bedroom area is the gap under the bedroom door.
The door is a 28" wide with a 1/2" gap between the bottom of the door and the hardwood floor.
So, there is only 14in² of return from the bedroom

The question is: What should I do here?
I cannot cut 5" or 6" off the bottom of the bedroom door (140in² gap)
And I am not going to cut a hole in the door or the wall.

I think I need to add a 12" x 12" vent that simply connects from the bedroom into the hallway (point to point).
This actually might be a good idea. If I place the new return in the walk-in closet, that would draw some heat / AC into the closet.

What are the alternatives?

If I add the return vent, should it connect into the 20" plenum of the return vent instead of dumping into the hallway?
I would have to add a 12" x 12" filter to this new return in that case.

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01-17-2018 09:39 PM  8 months agoPost 2
Dan Minick

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Columbus, WI

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Does the hallway and bedroom share a wall with a return in the hall? If so just pop a hole in the bedroom and connect to the same return.

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01-17-2018 10:32 PM  8 months agoPost 3
RM3

rrElite Veteran

Killeen, Texas - USA

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I have the same issue...

Master connected to bath, bath connected to walk-in closet each with an AC vent...

the issue is with the heat.... it gets too damn hot... I get all the heat from the closet vent plus the bath vent plus the whats already in the bedroom.

my solution for this case was to close the closet vent and bedroom vent (still blows a little)... so all I get is what coming from the bath.

but still the same issue as yours... door slams too.

the same A-hole that designed this totally screwed up the drier outlet vent.... its like 20 feet... goes into the wall down a 90 then makes a left turn with another 90... runs about 18 feet, then makes another upward 90 then another 90 out of the house... when the drier is running I get a gentle hot breath out of it and it takes twice as long to dry the clothes as before at our old house (it had less than 1 foot total run)

then the cousin must have done the wiring... the back yard and front yard outdoor receptacles are GFCI-ed to the plug located in the garage at the other end of the house... WTF

makes me wonder what these builders actual credentials are.

showing a preference will only get you into trouble, 90% of everything is crap...

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01-17-2018 10:46 PM  8 months agoPost 4
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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Does the hallway and bedroom share a wall with a return in the hall? If so just pop a hole in the bedroom and connect to the same return.
No common wall
Any new return in the bedroom would have to be in the ceiling and that new duct would be routed to the 20" return duct or the hallway ceiling.

The more that I think about it, the more I think a new return duct in the bedroom would have to be connected to the hallway return duct and not simply routed to a new register in the hallway ceiling.
When the blower kicks in, the inside of the 20" hallway return duct is a low pressure area that will draw air in through the bedroom's new return register as soon as air starts flowing out through the normal registers for heat and AC.
Otherwise, the bedroom would have to "pressurize" and force air out the new register or through the door.
And, the door might still slam before the air is forced through the new return register

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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01-18-2018 12:45 AM  8 months agoPost 5
crflyer

rrApprentice

Maine

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Tie the room to the return air duct and be done with it, the room will heat /cool better and no more door slamming.
Or put in a louver door.

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01-18-2018 02:11 AM  8 months agoPost 6
rcflyerheli

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Granbury, TX USA

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Our house is set up exactly as you describe yours, except that we have a 12 x 12 return air duct over next to the wall between our bedroom and bath. The main 20 x 20 return duct is located just outside the bedroom door in the hallway leading to the bedroom.

I haven't really ever done any kind of analysis of ratios between heat/cool vent areas vs return vent area, but the 12 x 12 return duct does prevent door slamming.

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01-19-2018 03:04 AM  8 months agoPost 7
nitro fun

rrApprentice

Oc ca

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Run the r/a duct to the r/a plenum....

I always use a full 25’ flex duct on the return so thier is no fan noise from the furnice..

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