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Dear Experts, many thanks for information. Any research information about this topic? We already have air vent at fan coil units and air vent at top of shaft. Do i need additional air vent? Where i should put this vent. Can you point in the picture please.

Dear HVAC Experts, As you know there are some rules about hydronic heating systems routing(i.e. Fan Coil Unit system) in order to prevent air trap in the system which will lead heating capacity reduction. I prepared one example and need your thought about this situation: - High rise building. -...

Dear HVAC Experts, Do you know any software to prepare report with Psychrometric chart for the AHU unit selected based on our requirements. - Cooling Coil + Reheat Coil (Dehumidifing) - Heat Recovery Preheat + DX Heating - Mixing AHU with Cooling - Heating AHU with Humidifier Thanks for...

Many Thanks.

Dear Friends, many thanks for information. Can i find any datasheet about exact DeltaP and Flow rate relationship at fully open position and below minimum DeltaP value? Why I am looking for this is, we have less amount of deltaP available in the system and trying to understand outputs of each...

Dear experts, I was wondering about mechanical charecteristics (Q and deltaP) of picv valve at low deltaP situations (below min deltaP requirment of picv.) As you know at datasheets it is talking about deltaP over 10kPa only, however i was wonderful what will hapen if we provide 5kPa for...

Thanks for feedback. But still there are big difference between Catalogue (6.1 m) and NFPA 13 (4.3 m) standard. :(

Dear Experts, I am confused about maximum coverage distance of sidewall sprinkler when we put two sidewall sprinkler at the opposite walls(throw): - As per NFPA section 8.9 and 8.7 maximum throw distance of single extended coverage sidewall sprinkler is 4.3 m (see photo below) - at the...

Thanks a lot.

Dear Experts, I was wondered if there is any requirement about minimum / maximum which size of branch pipe it is required to apply seismic expansion joint at the dilatation part of buildings. Is there any reference about this topic in the NFPA? [dazed] Thanks.

Dear Experts, I was wondering if there is any restriction to put boiler room at the basement level. (below grade) Boilers are natural gas type. There is mall located at above levels. Please refer international standards: IBC, NFPA or similar.

Many Thanks. Where can i find free soft copy of mentioned standards?

Dear Experts, As you know SMACNA gives recommendation about construction standards only for upto 2500 Pa (10 inc Wg). It is really strange that there is no any information about Duct construction standard with the static pressure over 2500 Pa (10 inch Wg). And i search internet and could not...

SprinklerDesigner2, thanks for your Help. Can you refer standard section for this information, please?

Dear Experts, there is big confusing at the NFPA 14 to understand. It is stated that for Class I: maximum allowed pressure - 175 psi (12.1 bar) minimum allowed pressure - 100 psi (6.9 bar) It is stated that for Class II: maximum allowed pressure - 100 psi (6.9 bar) minimum allowed pressure -...

Dear Experts, I was wondering about NFPA and IBC requirement about Fire Dampers. Please consider inputs as: - Building is High Rise Building - There is Stairwell Pressurization considered. - No any smoke exhaust considered at Fire zone. - There are 2 Ventilation shaft one for exhaust and one...

Dear UFT12, Thanks for your help. Based on your comment I am trying to calculate GPM using two method 1. sprinkler system demand (+ hose stream allowance) and 2. stand pipe system demand and then as stated (14:7.10.1.3.1.1) i need to get greater value from this two results. Nothing confusing...

Dear Experts, There is confusing topic about NFPA 14 and NFPA 20 to discuss with you: If we have Fire Pump serving to header and this header serves to Class I stand pipe system, Class II stand Pipe System and Sprinkler system. (3 pipe coming from pump room). Can we consider this system as...

Dear Experts, we have 4 commercial kitchen located near to each other. My question is, what is international standards requirement (IPC or equivalent) for venting systems at kitchen drainages. I mean do we need to add vent pipe for kitchen drain if there is no any water closet connected to...

Dear Stookeyfpe, I edited my post based on the question came from you.