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Hi, I am back from ASHRAE in NYC, the buzz word this year is of course Green and Sustainable Design. It would be beneficial for our forum to get some definitions and examples of this topic. I for one want to know more on the sustainability issue and how to apply it to HVAC design. thanks,

Hi, I need to learn more on the induction box application. Is it still used? I am looking at remodeling a 30 year old large facility, and on the old plans I see boxes that looks like a VAV box supplying air to the rest rooms, but labled as an induction box. Are there any manufactureres...

I am not sure if this is the correct forum, but any help will be appreciated. I was looking at a package of plumbing submittals and for water closets, the supplier had the water surface areas listed. Are there any standards on this parameter. What is considered code, good or un-acceptable...

Thanks for all your contributions and questions/answers.

Hi, Does ASHRAE 62-XXXX have any values for exhaust from rest rooms in public buildings? What is the min required from Building code perspective. I am confused because some codes refer to Area, some to People and some to Number of stalls. Thanks,

Hi, What is the required wall fire rating for the boiler room of a dry cleaner shop? How about the wall rating for the entire store. I am working on the MEP for construction of a dry cleaner as a finishout inside of an existing shell building. Shell building is brand new. Has fire sprinkler...

Hello, This may be a simple one. I have a 12000 sq-ft white box finish out. It needs to have 2 RTU's @ 15 ton each. Fresh air should be at 25%. Can a baromtric relief damper on the unit compensate for the extra air brought in. Does it depend on the unit construction? Or do I need to relief...

Hi Guys, I am looking for a windows based BASIC compiler. I used to be good at programing in basic and also I have some design programs that I want to use now. Thanks for any information.

I am looking for an optimum elevation AFF for round air diffusers. The space is a retail store with exposed ducts and 18 ft. high roof deck all open. I want to keep the top layers of air stagnate (near the roof), and keep the lower occupied zone conditioned. Diffuser throw is about 15 ft...

Hi, Is there a standard for the depth of a P-trap? Why is there a depp seal trop, is there a shallow trap also. I am looking to find the depth of the SS line just after the floor drain. How can this be done? It depends on the geopetry of the P-trap, is that correct? Please advice.

Please advise: In small tenant finish-out projects in strip shopping centers. I have used ducted retun to the RTU return. A contractor is asking for design change into a plenum return scheme. Last time I did this I got in trouble because the RTU could not keep up with the cooling of the...

Guys; I am just starting on a new project to finshout a tenant space for a dry cleaner. This is a brand new shell space with no AC currently. Can you guys advise on what the codes are for ventillation on dry cleaners. They will do cleaning on-site. I want to be sure to minimize cutting a...

Hi, I need to use an actuated valve on a sewer line (2 in. dia.). I want to drain when signal applied and closed when there is no signal. The water is coming from a car-wash operation. What should I look for in selection of valve and who are the manufacturers? Thanks,

Good Morning, A primary air duct (55 F) is going into a non-conditioned space, and after about 50 ft. in this space the duct feeds a series of discharge grilles which blow the cold air in to the space. What is the preferred type of insulation for this duct. Internally lined or wrapped on the...

Hi, What is the largest copper pipe dia. that is commonly soldered? How is 4in. and 6 in. copper lines in domestic and in mechanical systems connected? Flaged, threaded or soldered, or other means? Thanks,

Hi, This may not be just the right forum, but please give me your openions: Where should the expansion tank in a domstic water heating piping go? Before the water heater on the cold water line or after the heater (on hot water line)? Is the concept similar to heating water piping? Also, at what...

Good afternoon, I have a 4 inch glycol line (at chill water temp) that needs to be insulated since it is running outdoors along side a vertical wall at 10 ft.AFF. What is a common insulation thickness for Houston,TX. What is the bright metallic jacket called that is over the pipe insulation...

Hi Guys, I am looking at some old plans (around 1971). THey show a few large boxes as induction boxes. What is the function of this box? thanks,

Good Morning, Guys can you help with these questions please: 1- How is the insulation requirements & construction type noted on mech-plans for aduct passing thrugh a basically unconditioned space. This would be a high pressure primary air from an AHU to a few fan powered boxes. 2- I am looking...

Good Morning, 1- What is the best way to indicate insulation requirements & construction type on mech-plans for duct passing thrugh a basically unconditioned space. This would be a hight pressure primary air from an AHU to a few fan powered boxes. 2- I am looking at some old mech plans from...