Posted By Eddie1 Hi all. Question on air conditioning any opinions would be welcomed. Working for a telecommunications company that is modifying a room to take specialist equipment. The room will have an air conditioning system that will continually recycle the same air within the small room with at least 3 racks of equipment installed. As part of fire prevention a FM200 system has been installed and this requires that this room is hermetically sealed thus, the only possibility of any air movement relies on the door being kept open, which defeats the purpose of the security required to operate the system. There will be (or should be) one person at a time working in there at a time for periods of an hour or so. Is this an acceptable working environment what are the Health & safety implications, any opinions would be greatly welcomed. Thanks

Posted By Merv Newman Your FM200 system should have provisions for closing doors and A/C vents before setting off. Normally provided with a delay for occupants to leave or even cancel release before the system goes "whoosh" So NOT hermetically sealed until the double-knock is detected. Short delay (15 seconds ?) for occupants to react. Then hermetical sealing comes (occupants can still exit) in and THERE SHE BLOWS Mind you, I've not done one of these since freon was the bee's knees. Or was it the cat's whiskers ? Maybe it's just a gas. Merv greying wolf