I'll pass on everything but the closets. We have a 10x7 walk-in closet off of the master. The HVAC guys did not feel it needed to have a register, but put one in at our request.

Our closet has two exterior walls, including an unshaded west facing long wall on the gable end of the house. That helped drive our decision.

We found that it works best if we keep it just barely open. Anything else, and it over heats or over cools the closet. Since we have all tile floors, the door undercut easily handles the return air. There is a dedicated return in the master bedroom.

Based upon our experience and the plan you posted, I would say you don't need registers in the closets. I would suggest that if you decide otherwise, make sure there is a return path for the supply air, otherwise you will pressurize the closets.

It's hard to tell because of picture size, but I noticed that your plan has small closet doors, roughly 24 inches wide, as far as a I can tell. However there does not appear to be any room for trim.

It looks like the openings, trimmed out, will support only about eighteen inch doors, twenty at the most.

Have you rendered 3D views of those doors from both sides? That will show you how they will look trimmed out.

Just thought I would mention it.

At a minimum, interior (mostly interior) walkin closets should have a return air register

"At a minimum, interior (mostly interior) walkin closets should have a return air register"

The idea being that the return will draw conditioned air into the closet, I presume. What do you do if there is tight fitting carpet under the door, fit a transfer grill over the door?

Just want to send an update. The inspector came through and said we need registers in any walk-in closets that have an exterior wall. This was a good way to solve it! Also, he said he thought the right bedroom should really have one more register, so he requested that or a Manual J to show it was okay. The HVAC guy is adding those 3 vents and I'm pleased with that. He said he can't really add one in the left master b/c there is a TJI under the left wall under the windows, which would make the register quite far from the wall. The return is adjacent to that toilet, so there's no point in putting one on that wall either.

Thanks for your help!

"What do you do if there is tight fitting carpet under the door, fit a transfer grill over the door?"

Yes, but ugly, best to cut bottom of door. Doors should'nt rub on the carpet anyways.

Make the contractor show you the Manual J for this plan. That is why the building inspector said if the Manual J said 2 registers, that's fine by me. The fact the contractor did not produce the Manual J and caved and said he would put in the extra register, lets me believe he never did a Manual J (and Manual D for duct work) and this is all seat of the pants.

It is really difficult to say about your registers because we don't know where you live, do you have heat and a/c through vents. What size registers - they differ by a more than a factor of 2 between small and large. Are they ceiling or floor vents?

If you live in Fl and a/c is a fairly constant thing, then you really want big vents so they are quiet. If you live in the North, have radiant heat, then your needs for air flow are much less.

Which gets back to the manual D and J's that you need. But given that you are too late in the game to deal with shopping for HVAC contractors, I would over vent and pay extra for it if necessary. I have manual D/Js done but not enough vents in my opinion (partly because I have of a zoned system). HVAC contractors (and yours for sure) like to put in a minimum of vents for obvious reasons. I am getting ready to embark on increasing sizes of vents and adding vents to my master bedroom - oh the joy of blown in fiberglass insulation. My house is less than a year old. I am annoyed by the noise and I have a variable speed blower.

Air flow under doors is bare minimum IMO. My doors whistle at high output - I'd do returns in all bedrooms if I had to do it again (and I might add them). Most walk in closets have a vent in my house. The one that doesn't is a bit warm in the summer (east facing single wall with energy star sealing and above code insulation). The walkin pantry with no vent feels a bit cold in the winter (1st floor, single east facing wall). A pantry that is a bit cool is not a bad thing and at least it doesn't get hot in the summer. Neither of these closet issues are enough for me to add a vent - they are small - maybe 5x10. Our master closet has 2 vents but it is bedroom size. We have 2 vents in simlar size master as yours and I'm adding another one.

It is really difficult to say about your registers because we don't know where you live, do you have heat and a/c through vents. What size registers - they differ by a more than a factor of 2 between small and large. Are they ceiling or floor vents?

If you live in Fl and a/c is a fairly constant thing, then you really want big vents so they are quiet. If you live in the North, have radiant heat, then your needs for air flow are much less.

Which gets back to the manual D and J's that you need. But given that you are too late in the game to deal with shopping for HVAC contractors, I would over vent and pay extra for it if necessary. I have manual D/Js done but not enough vents in my opinion (partly because I have of a zoned system). HVAC contractors (and yours for sure) like to put in a minimum of vents for obvious reasons. I am getting ready to embark on increasing sizes of vents and adding vents to my master bedroom - oh the joy of blown in fiberglass insulation. My house is less than a year old. I am annoyed by the noise and I have a variable speed blower.

Air flow under doors is bare minimum IMO. My doors whistle at high output - I'd do returns in all bedrooms if I had to do it again (and I might add them). Most walk in closets have a vent in my house. The one that doesn't is a bit warm in the summer (east facing single wall with energy star sealing and above code insulation). The walkin pantry with no vent feels a bit cold in the winter (1st floor, single east facing wall). A pantry that is a bit cool is not a bad thing and at least it doesn't get hot in the summer.