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Sorry to everyone for not providing feedback, work has been hectic lately. I've attached an image of a sketch regarding the noise from plenum boxes. Grille dimensions (and plenums width*lenght) is 1025x75 mm. Taking into consideration an effective area of the grille, air speed thru the grille...

Is there any equation or recommendation that I could use in order to see if my plenum box (with grill attached) will produce noise? Grills supply air to a public area and therefore, I would like to eliminate as much noise as possible. Air speed thru the grill is around 1,2 m/s.

Regards to all of you. I have a small problem that I can't really solve fully at the moment. I am trying to determine whether there will be a condensation in/on an insulated concrete wall. I've managed to determine the heat transfer rate thru the wall and temperature between each layer. Now...

@LittleInch Just for final clarification: Design calculations determined that at 50k m3/h, system has a pressure loss of 400 Pa. So, if I pick two fans with 25k m3/h @ 400 Pa each, it means that in total, when both fans are operating, I will be getting 50k m3/h? And when only one of them is...

Basically, it's not really a conclusion that I came to, it's more of what I've been told. I just wanted to make sure that there is actually no differrence between pumps and fans when it comes to parallel work mode. My problem is that I have a smoke exhaust system that has a workflow of 50 000...

So, I have a quick question and would be grateful if someone could explain me the difference. When you have 2 centrifugal pumps working in parallel (with same head and flow), resulting operating flow is not two times the flow of a single pumps, but somewhere in between (with head staying the...

@lukaiENG Thank you for your concern, but I used the workshop as an example, to better describe the type of literature/documents that I am trying to find. I am looking for them for my own needs. @dbill74 Tried SMACNA, but had no success so far.

As title suggests, could anyone help me with providing literature for spiral and rectangular sheet metal ducts work sheets? Basically, I need drawings for parts of the ducts (Tees, rectangular to round section, crosses etc.), in their 'laid out' form, before the bending etc., so I can send them...