Standard Codes for Laundry Exhaust Air Changes

Assuming the dedicated exhaust systems draw air from the room into the equipment and exhaust to atmosphere, I would check the ACH due to that. You might find there's no problem.

Thanks Codemaster for your prompt response.

What is the general ACH for laundry? Any reference will be appreciated.

Can laundry ACH be higher than the kitchen?

Sorry, but I've no idea. It isn't my field, I was just making a general comment. But I can't see why a laundry would need to be much different from say an office. If dry cleaning is used there might be a need for higher ACH to disperse solvent vapour.

<...disperse solvent vapour...> What - all over the neighbourhood?

It ought to be collected and re-used!

Yes, why not? There are plenty of occasions where it's not possible or practical to remove all nasties, but OK to discharge to atmosphere, where it's well diluted, rather than expose the workforce to it. I've had dry-cleaned kit where you could still smell solvent, unlikely to be high enough concentration to recover, but the staff would prefer not to breathe it all day, so no doubt the place had adequate ventilation.

Gas powered clothes dryers might be a factor.

Most laundry facilities I've seen have little in the way of ventilation....mostly open doors front and back.....sometimes a fan mounted in the wall.....Kitchens on the other hand generally have a fresh air supply that is exhausted out the hood...

http://www.inspectionnews.net/home_inspection/fireplaces-chimneys-and-solid-fuel-burning-appliances-home-inspection-and-commercial-inspection/16787-laundry-room-exhaust.html

If you leave doors open for laundry you are allowing very humid warm air into the space (tropical coastal location), dust and other contaminations...which will affect not only people but also machines and linen. We been requested to install a treated fresh air with filters....our request for louvered doors has been flatly rejected.

So then you go with package on the roof with a fresh air intake....

First check your local codes. These will be the determining requirement for number of air changes per hour. Solar Eagle has given you some idea of ranges.

Remember, since you will be exhausting air, you will have to provide for a make-up source.

Also remember that since the air being exhausted will contain dust and lint, some sort of filter will be required on the intake.

Am I reading 'directly hard connected' to the equipment? If so you need to talk to the manufacturer. They will have info on the amount of air needed. I say this because of your reference to kitchen equipment. Most kitchen equipment is not rated to be direct connected to the exhaust. Hope your project goes well. - Circuit Breaker