25362 - I am curious about that diffuser term also. I have no HVAC experience so I was laying back.
But, diffuser is normally a speed reduction device that like you say, can also be used change or eliminate a direction of flow.
However, being in a picky mood, I would never call a diffuser anything intended just to straighten flow out because technically speaking, a diffuser changes flow from velocity to diffusion by speed reduction, thus the name diffuser.
I am thinking like you that perhaps vmonceller is talking about a flow straightener?
If so, then they are best to be avoided, no practical way to specify one easily and be sure of the results.
Usually scumbag architect never checked with pump guys nor does the architect want to leave enough room for the dog gone pump intake which always seems superfluous to everyone, no need to allow for that, just jam that 'ol pump in the corner somewhere. Then we go get a flow straightener which does not work half the time, so they just replace bearings more often, but hey, we all have to work and there is no real problem says the architect that moved on down the road telling people what a great guy he was, works with engineers real well, knows how to handle 'em.
OK, I’m a little screwy today. But hey, what’s a forum for anyway, just want to blow off steam a little. I’ve tried to cooperate with architects often. Job this year overseas left bad taste AGAIN. Every time I figure out a correct set of pumps and intakes, scumbag architect changed it and then attempted to tell me that it should not be a problem, then they tell me how to fix it, then I just kept my mouth shut while I imagine evil things I would like to do to him, then tried to stick my hand through the phone cord to get a grip on the little rat’s throat while he arrogantly tells me, “Sorry, but that is where the pumps are going, and this is the route for your intake lines”, and now my suction speed is …, hopeless!!!
After that loser architect and his buddies finish the roof will leak, paint will peal, sidewalks will be under water, site drainage will be screwy, glass will pop out of the frames, everything will be wrong with the building. S then that filthy rat scumbag will tell the owner, you gotta watch those engineers and the contractors, If I was not there to help you just imagine how it would have turned out.
May the fleas of a thousand camels infest his armpits.
Ahhhhhhh, feel better now.
PUMPDESIGNER