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The manufacturer says that it is o.k as long as the insulation doesn't interfere with the motor's operation much like what Chicopee said.

First of all, it is preferred to keep a positive pressure in the ups. How is air supplied to the room? You need to account for humidification/dehumidification needs. If your supply is too cold, it might lead to electrostatic discharge. Be careful when setting the supply temperature. According...

you can use 10 ACPH for the UPS room and 5 CFM/kVA of transformer for the transformer room. This is a rule of thumb, you must check with the design engineer for a more accurate answer.

Chicopee, The sides of the damper are insulated. The motor is not so that heat can be dissipated to the surrounding air instead of it being trapped between the motor and the duct which might lead to condensation. I did not want for the damper to be completely exposed to surrounding air, which...

Hey everyone, I need your help on the following. Do fire dampers (motorized) need insulation when they are installed in the supply or return line to prevent heat loss and condensation? In the fresh air ductwork, you don't but I'm afraid that on the supply and return you might need to insulate...

"Example: If the Expansion tank is charged at 40psig and the pump head is 30psi. 1. If the expansion tank is installed at the suction side of the pump. The suction pressure is 40psig and the discharge pressure is 40+30 = 70psig. 2. If the expansion tank is installed at the discharge side of...

guys, the issue is not thge material of the duct for this has already been agreed upon. Ducting serving hazardous areas will be SS (fully welded). The issue is the connection between the two materials which will be done in an adjacent room. The ss branch will connect to the GI duct in an...

Hey Guys, The switch from GI to SS is for protection purposes. The room the SS duct is serving has batteries in it and due to chemicals GI might corrode thus the change in materials. The SS is used in the supply as well as the exhaust.

Room temperature setting is up to you (but you have to be careful with humidity and condensation). Minimum ventilation rates can be found in ASHRAE 62.1 To get a negative pressure you have to make sure that exhaust air flow rate is higher than the supply flow rate. I would also recommend blast...

Anyone???

Hello everyone, Is there a risk from connecting a Stainless Steel 316L duct to a galvanized steel duct directly together (only thing seperating them is the gasket in between the flanges)? If so what would be the recommendation to avoid galvanic corrosion? On a similar note, let us say there are...

Thanks for the confirmation

When the pump operates, the pressure differential of the pump will higher than zero. The pressure at the discharge will be equal to the pump head whereas the pressure on the suction side will be equal to the pump pressure minus the pump head. is this why the expansion tank should be installed on...

thank you guys! enlighting posts however i need the mathematical explanation for not installing the expansion tank at the discharge side of the pump.

Hey guys, Can someone please explain to me mathematically why should the expansion tank be connected to the suction side of the pump and not at the discharge. I can't seem to understand the point of no pressure change. Doesn't the tank itself exert pressure on the water network? Expansion tank...

IRstuff, I am just asking out of curiosity

ok guys! thanks a lot!

IRstuff, would 50 mm of insulation resolve it?

IRstuff, The fan will be constantly running. Supposedly it won’t, I think a backdraft damper would resolve the issue, don’t u? And r u saying that condensation has a low probability of happening?

RandomUserName, the air coming out from the room is the coke taken out from the fridge in your example, right? the room's air dew temperature is lover than the outdoor's temp meaning it should condense 23<39