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Baseboard register/vent sizing

We recently purchased an older home (1943) I need to replace the old baseboard register. They had a 24inch baseboard register and upon taking it off and measuring the vent opening is only 15inches. Do ...
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How to Secure a ceiling register tight?

I've bought some very nice oil bronzed ceiling register ( 4 x 8 inches)for the bathrooms, while re-modeling an old English Tudor. They came with clips that fit on each side of the register and when ...
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2 vent fans in parallel = double flow rate?

My basement stinks, I am thinking about adding some ventilation that pulls air out of the basement via an unused chimney pipe. Home Depot sells this in-line 6" vent fan that supposedly does 160 cfm. ...
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Metal around wall register boot for trim

Below are two images of what im talking about. Around the duct boot for the wall register is a metal box to make up for the difference between the wall and where the trim ends. What is it called and ...
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Appropriate register for duct size?

So I asked a long-winded version of this question in another thread, but haven't really received any good responses yet. I'm going to condense and try again... There is an 8" duct feeding a 6x12 ...
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Would increasing the size of the A/C duct for my kitchen improve cooling?

As part of an ongoing kitchen project, I'd like to relocate the existing a/c register in the ceiling (which is located next to an interior wall) to the center of the room and upsize the duct (and ...
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Are there optimal positions for A/C and heat register grills to be facing?

I noticed a while ago that some of my A/C and heat register grills are facing the walls and not the room (the insides of the curves on the grills face the walls) in some rooms but not in others. My ...
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Damper close to main supply vs damper close to the register end: what is the difference between the two positions?

For the air duct that feeds a room, what is the difference between installing a damper at the register end and installing a damper close to the main supply duct?