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Just started up my design consulting firm, looking for some rules of thumb for MEP design fees. What is typically used for creating proposals? A percentage of construction cost? $/SQ.FT? percentage of architectural fees? Thanks.

Designing a new commercial kitchen with multiple grease hoods. Got a review comment stating the need for an air curtain (to prevent insects from entering) above the 3' side door. I assume this door would be used for supply loading, so it may be open for somewhat extended periods of time. My...

Typical kitchen grease duct application, fully welded carbon steel. Is the connection to the roof-mounted fan welded as well, typically speaking of course. Or is it flanged and gasketed? Thanks Also, separate, but related question. In a fume hood application, with welded, stainless steel...

Trying to calculate dining room ventilation requirements for a commercial cafeteria. The most conservative occupancy count would be to simply count the number of chairs in the dining area. However, I've heard in the past that this number is discounted due to the fact that all tables are never...

Designing a job in Wash, DC area, with exposed chilled water piping (air cooled chillers on grade). Intially planned to use heat trace, but was directed to use propylene glycol due to the "reliability" problems with heat trace. Anyone have any experience with heat trace failures? Any...

Yes, I have 3-way coils on a portion of the loads to maintain a minimum circulation in the secondary loop. The chillers will not be operating unless the secondary pumps are on, so the "system" volume should be the entire secondary system as well as the primary. Thanks for your help.

General question regarding buffer tanks for chilled water systems. I have a primary-secondary system with two 70 ton air-cooled screw chillers. My total system volume is approximately 950 gals. The system is mainly serving fan coils units with 2-way modulating valves. Do I need a buffer...

http://www.jm.com/insulation/technical_info/media_3020.htm Discussion of non-fibrous liner alternatives. They're out there, the VAV box manufacturer's also offer a non-fibrous liner in addition to the foil faced option.

I'm looking for an equation to determine the heat gain (delta T) of an air stream passing through a HEPA filter. I have the flow rate, velocity, static press. loss, and I'm sure there's a way to determine the heat gain to the air from the pressure loss, I just can't seem to locate it. I...

Desiging a building with 1 and 2 bedroom units. Using Air cooled chillers and modular non-condensing boilers. Trying to select coil delta-T's for the chilled and hot water, just wanted to get some opinions. Planning to use 44F-56F chilled and was hoping to get 30F delta-T across the hot water...

Looking for total price (material, labor, O & P) for armaflex on refrigerant piping (for 3-ton split DX), probably 7/8" or 3/4". Contractor has it @ $14/LF, seems high. Note: looking for price of insulation, not piping. Thanks

Is the make-up air being introduced at the hood? With your numbers of 70%-80%, it sounds like you may be using a preforated plenum type of hood. If not, look into these. They provide good capture and containment, and have a low velocity make-up air stream that dumps air into the space right...

What do you typically use for the heat rejection for transformers in elec. rooms? I've heard 5% of the kVA rating, but this seems to get my airflows a little high. I have an 10'x12' elec room with (2) 45 kVA and (1) 30 kVA transformers, and using the 5% rejection, I get a cooling load of about...