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1 Answer

HVAC duct size versus grille size

For proper air being returned to the HVAC unit that is the size of the duct have to correlate to the size of the grille for the return air? So for a 12 inch air filter grille what is the largest size return duct that could be attached to that for proper operation?

I’m getting air pressure coming from the attic through the switches ,outlets ,and around the drop ladder in a different zone than the one with what I believe is undersized return.

Thanks Rich

Asked By Richt1022 | Jun 18 18
1 Answer

HVAC UNDERSIZED RETURN AIR DUCT VERSES RETURN AIR GRILL SIZE FOR PROPER EFFICIENCY

I have a grill that accommodates a 12 inch air filter my question is what is the adequate size return duct for that size register. What is the largest duct that can be used for the HVAC unit to run efficiently for a grill that holds a12 inch filter. I’m getting air pressure coming from the attic through the switches ,outlets ,and around the drop ladder in a different zone than the one with what I believe is under sized return.

Asked By richt1022 | Jun 18 18
2 Answers

Plumbing too close to edge of slab

A plumber set a vent pipe within a 1/4" of the edge of the slab on one of our jobs. When we told him to move it, he cried. I was surprised to find that this was not covered in our specification and I could not find it in code documentation. In fact, I could not find it anywhere. We have all seen concrete on the edge of a slab bust out around a vent stack or a piece of rebar that was too close to the edge of the slab.

So what is too close?

Asked By Hugh Stearns | Jun 18 18
4 Answers

Circulating air between floors

I don't see a lot of air mixing between floors in my (partly finished) house. We had a hot day here yesterday (34C / 93F), and by sunset the first floor was 22C / 72F while the upstairs was around 24.5C / 76F. This doesn't surprise me, as hot air obviously rises, plus the 1st floor has the benefit of the slab heat sink. What surprised me is that this morning the temperatures were the same. I would have thought with minimal heating going on during the night, they would have equalized at least somewhat.

Asked By Trevor Lambert | Jun 18 18
4 Answers

Exterior vs Interior blinds

I know exterior has superior performance, but can anyone quantify how much? The latest heat wave has me lamenting the fact I didn't go with motorized, exterior blinds for the four east/west windows. Original plan was interior blinds. It's not too late to change plans, though the timeline is getting pretty tight.

Can anyone recommend a place to get these at a reasonable price? I priced them out locally last year, and they were a lot (I think four of them came close to the cost of a ductless minisplit).

Asked By Trevor Lambert | Jun 18 18
6 Answers

Bonus room temperature and humidity

We just moved (CZ4, humid) and have a finished bonus room above our unconditioned garage. The insulation is poor. Heat is electric baseboard. AC is currently none. The room is not in regular use. For example, we did not turn on the heat this winter.

If the room were in use, it would be ideal for a minisplit. But, we rarely use the space. Other than a large tub of DampRid, there is nothing up there to protect the space.

What do we need to do to avoid problems from seasonal temperature swings and/or humidity? Can we simply leave it closed and locked, excepting when we have houseguests?

Asked By FrankFulton | Jun 15 18
8 Answers

Mortar bridging and droppings

General question on Mortar Bridging and Dropping workmanship.(CZ4)

Here are a few images of some brick veneer on a house. Its not mine, but it is from the builder I will be using. I've read that droppings and bridging are "bad" but I don't know what constitutes good vs typical vs poor. So I've attached some pictures to get others viewpoint on the quality of this work. There is a single layer of tyvek and then OSB behind that, and I'd say ~1" of space behind the veneer, at least where there is not bridging.

Asked By Stephen Cook | Jun 16 18
8 Answers

Room over garage

Hi

Climate zone 4c / Seattle / New construction

We are building a new house which has a studio over the garage deck. The raised subfloor of the studio is built with 2x4 sleepers over garage deck. The subfloor sheathing for the garage deck and studio is Advantech.

How do we detail the void spaces between the sleepers? I am worried about moisture getting in there either through condensation or leaks. Currently, the plan is to fill the voids with XPS and tape the seams. However, I don’t trust this solution to get rid of all air pockets.

Asked By Jay Raja | Jun 16 18
5 Answers

Ceiling insulation for a room addition to my house

I'm planning a room addition, 16 x 16 with a 6/12 gable roof and cathedral ceiling, zone 6. I'm not yet committed to anything specific so would like to run this scenario by folks for advice and opinion. I'm wanting to avoid the 5-6 inches of exterior foam (R-25) that would be needed if I went that route. And, I would like to go unvented. Would the following scenario work?

Asked By Howard Gentler | Jun 16 18
3 Answers

Replacing R410a minisplit: Lineset cleaning, pressure testing, and purging

Should I use a cleaner designed for converting from R22 to R410a linesets to clean a lineset that will only replace a R410a mini split?

I am replacing a 7.5 year old Samsung 1 ton unit with a Fijitsu 1 ton unit. These are both single units. They both require 1/4" and 3/8" lines.

I've gotten mixed answers from many HVAC professionals on this question. It seems like the wild west here in Wisconsin on mini-splits (and other HVAC subjects).

Asked By Resilient_Kevin | Jun 14 18
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