thread403-435647
My conclusion after reading the referenced thread, etc.:
For a bell mouth inlet on a rectangular duct in a return air plenum: using a 6” bell length with 45-degree sides is probably adequate – if it can fit in the available space.
Some TL;DR for that conclusion:
As said in...
Hello,
Please help regarding advice from someone with more venting experience than I have.
I think a vent is needed for the most remote floor drain in the image below.
The EOR says the vent on the sump pump is sufficient.
This may be accurate if: 1) it can be treated as a "combination waste...
Which vibration isolator complies with a specification that requires a "minimum static deflection of 1 inch" (where the load imposed on the isolator is 300 pounds):
Proposed by the contractor: An isolator with a rated deflection of 1 inch at a rated load of 500 pounds in the manufacturer’s...
It seems to me that pump vibration isolators need to support:
1. The weight of the pump
2. The weight of the water in the pump
3. The weight of the water (only) in the drop to the pump
The supplier of vibration isolators on my project does not seem to share this view.
I understand that pump...
Doesn't the force on the support leg of a suction diffuser depend on:
[ol 1]
The pressure inside the housing?
The size of the inlet pipe?
[/ol]
Page 11 of the instructions for installing a suction diffuser says only...
I hear that coalescing air separators are much quicker about removing air from a system. They are also supposed to be better at removing "dissolved" air.
They are also filled with media that seems subject to clogging (hence, higher maintenance cost), and I think their purchase price and...
Is the industry moving away from lead-free chrome-plated brass ball valves for domestic water systems?
As there was some confusion during a conversation with one supplier, I am referring to the ball being chrome-plated, not the valve body.
A Brand-X supplier said they stopped making them...
Manufacturers of drip pan elbows seem quick to "highly recommend" their use, but they may not be practical when a vent line must run through several stories from a basement mechanical room to a roof.
The following may be optimistic maximum lengths for vent lines from drip pan elbows for...
When is it recommended, or not, to use the flange taps provided by a pump manufacturer for connecting pressure gauges?
The detail at the link below shows one gauge connection to the flange tap on the suction side of the pump; the other is downstream of the flex connector on the discharge side...
Are the benefits of using an antimicrobial coating on ductwork justified by the added cost?
It is not mentioned in the VA's specs here:
http://www.wbdg.org/ccb/VA/VAASC/VA%2023%2031%2000.pdf
My read is that the colloidal silver coating:
[ol ]
Is activated by moisture; If the inside of the duct...
Why place the valve between the syphon and the pressure gauge as shown in Figure 5 on page 7 of the following link?
http://www.spiraxsarco.com/pdfs/IM/p027_02.pdf
An arrangement with the valve between the pipe and the syphon (about 3/4 down the page, third image from the bottom, in the link...
Paragraph 401.2 of the 2012 IMC requires mechanical ventilation for dwelling units if the infiltration is less than 5 AC/hr (0.667 cfm/sf with an 8-foot ceiling) at a differential pressure of 0.2 iwg.
Paragraph C402.4.1.2.3 of the 2012 IECC doesn't allow the leakage to exceed 0.4 cfm/sf (3...
