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Thanks Stookeyfpe. Your example of Group R-2 apartment building explains that well. But again, What if the building in your example is Group A or Group B as primary occupancy and have some restaurant or some chemical store as sub occupancy. Even in this case items 2 through 6 of IBC 906.1 are...

The question is related to section 906.1 of IBC. The section clearly defines 6 locations (under item 1 through 6, apart from table 906.1) where the fire extinguishers are required. The confusion is in exception of item 1 where it says "Exception: In Group R-2 occupancies, portable fire...

Thanks Stookeyfpe. Now its clear to me that there is a conflict.

Stookeyfpe, Thanks for you response. I do understand that sprinklers are based on section 903 and standpipes are based on section 905. Based on section 903 any Group A building with 1000 occupant load is required to have sprinklers then how come section 905.3.2 gives a condition for standpipe...

Referring to section 903 of International building code, buildings classified as Group A-1, A-2, A-3, A-4 are required to have sprinkler system if any one condition under respective sections exists. In this case If I have a group A (Can be group A1 or A2 or A3 or A4) building with occupant load...

Guys, I would like to have some more thoughts on this from experts. Waiting..

Thanks Dbill74. That was great. Yes these classrooms are for elementary and high schools.

Yes GmcD you are right. A central AHU is supplying a full VAV system using an all air supply of mixed fresh air and return air. Yes the controls are challenging thats the reason I want to understand it more clearly. Thanks everyone for sharing your experiences but I am really looking forward...

Thanks for the response. Berkshire, the classrooms are all occupied at same time. SAK9, Your option is good but the client is more in favor of AHU and even in your case, ventilation has to be controlled in some way. Can you please put some light on my case.

An air handler is serving 10 classrooms each served by dedicated VAV box. As the classrooms are high occupancy areas, Ashrae 90.1 (2010) section 6.4.3.9 can be applied. The basic requirement to apply Demand control ventilation as per Ashrae 90.1 is that the area of the space should be greater...

Requirement of emergency stairways is more related to building code than NFPA. I think you should refer to your local building code requirements.

Thanks SAK9. Yes the duct pressure varies but we have VFD for fan which will maintain the duct pressure by modulating the fan speed in case any of the VAV box modulates. And why CAV box? normal Volume damper can do the same work in these spaces as that of CAV box. Please correct me if I am wrong.

Is it correct to have direct supply (without VAV box) in a space that is served by VAV system. For example : A building is having 10 different spaces and all are provided with VAV boxes. There are some internal spaces like corridors, Toilets etc. which actually doesn’t need VAV control...

Thanks littleInch. Its more clear now. I have expansion tank and pump at ground level. Maximum pressure the mechanical equipment can withstand in my system is 80 psi and my pump head is 50 psi. I will now design a tank considering maximum pressure of the tank as 80-50 =30 psi. That means that...

Thanks cdxx139. Yes it is high occupancy space. I am not adding co2 control because the system is already provided with energy recovery heat pipe and co2 is not required in this case as per ashrae 90.1. Any suggestions..

A space require supply air of 500l/s and its outdoor air requirement is 450l/s. If a VAV box is used for this space then maximum supply air setting of a VAV box is 500l/s and minimum airflow is set at 450l/s. How good is it to provide a VAV box with electric reheat coils in this case? The...

I have gone through many threads regarding expansion tank location, pressure requirements etc. One thing which is still not clear to me is the pressure P2 at highest temperature. I understand that this pressure is slightly less than the relief valve setting. I have two questions in this regard...

Check NFPA 14 section 7.6. 7.6 Minimum Sizes for Standpipes and Branch Lines. 7.6.1 Class I and Class III standpipes shall be at least 4 in.(100 mm) in size. 7.6.2 Standpipes that are part of a combined system shall be at least 6 in. (150 mm) in size. 7.6.3 Where the building is protected...

Stookeyfpe / Matthew, Even I think Class II hose stations (Fire hose cabinets) are not required when the building is sprinklered. Only Class I hose connections at Stairways and other locations given in IBC will meet the purpose of helping Fire department people to get into the building to fight...

Thanks for the answers. Cdafd, The building is sprinklered (mixed occupancy - Group A2,B). Total height of the building = 15.5 meters (Ground Plus 2 Storey). Section 905.5.1 through 905.5.3 gives the locations (not requirements) of Class II standpipe. Section 905.2 reference NFPA 14 but again...