Diffuser / Air Register Vent...Are they the same thing?

Best that I can tell, is that a grill is just a standard vent with a straight type grill work layout, while a diffuser, while still being a "register, vent etc", is meant to spread out the air over a wider area and usually have grill work with angled fins that blows the air in multiple directions. If you look up the definition of diffuse, this was the best I could find out. Diffusers are usually always installed on register vents and not air returns.

Air Vent Diffuser

Great question. I've been in the A/C & heating business for over 27 years and I don't know the difference. I've always called them supply registers and return air grills. Rarely do I use the term diffuser. I suppose there are differences between registers, diffusers and grills, but I can't determine what those differences are, even after looking at the Hart and Cooley website. The link is below.

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RE:

Diffuser / Air Register Vent...Are they the same thing?

I'm a seller on ebay & got hit with a question from a potential buyer asking me what the difference is between an air register vent & an air diffuser...After being a general contractor for approx. 30 years, you would think I'd have the answer to this...Well, I don't...If anyone does,...

The teaching received by JWs is the same the world over. All talks from the platform must conform to Society teaching. All public talks must be given from a Society outline (that is so exhaustive it leaves little room for anything else). Even answers given by JWs to questions from the platform must agree with what the Society has printed. No deviation from Society teaching is tolerated. The control exercised from headquarters is so strict that anyone holding to a differing belief on any point would either have to shut up and put up, or leave the organization. This uniformity, which JWs boast about publicly, is not biblical, as even a cursory reading of the New Testament shows. Paul said there were many 'disputable matters' that should not be argued over. The Watchtower Society tolerates no dispute about anything. Christian denominations agree solidly on the foundational, important doctrines of the faith, but they respect others distinctives. Cultural differences are also absorbed in healthy Christian circles. But if any JW disagrees about anything, he dare not voice it publicly, so the real answer to your Q is, 'Yes, but only publicly.'