Rain water at the grease tray?

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David Saulque

Senior Moderator
Any idea what causes rain water to get into the grease trays(drip trays) :) at the hood?

We have a new customer new hood system built for a hot food sub shop. The hood is an eight foot island-straight vertical to the roofs and a mushroom up-blast with a riser cap and a hinge kit.

We cleaned the system mid November and ever since he is getting water in drip grease trays after a rain. In fact they fill up after a good rain. Everything is normal and nothing seems in out of order.

We have checked everything-any ideas??? :confused:
 
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No real ideas about the leak, I'm sure have checked everything I would have. Have you tried to go back on a dry night, and spray water over and around the fan, while someone inside looks for a leak, if it is getting in the drip pan it is apparently coming through the duct, although I wouldn't rule out anything with out checking it out first.
I had a customer with a similar problem once, a leak that seemed to be coming from around or through the exhaust fan, and every time it rained they got water coming down the outside and inside the hood. We tried everything to recreate the leak to no avail. I went back one night during a storm opened up the ceiling and traced the water back to an Ac unit 10 ft away from the spot the leak showed up downstairs. So don't rule anything out.
 
There are phosporescent dyes that you can add to water. Spray it thoroughly all over everything, then with a black light, you can see exactly where the water trails to/from.
 
It is possible that the water gets in overnight when the fan is shut off and the rain is somehow spashing into the duct through the fan wheel / fan housing and down the duct.
I just had one of these a couple of weeks ago and that seemed to be the cause of water inside the hood drip cups.
 
Chris said it well. We too have seen 'holes' in the discharge apron of an u/b fan which resulted in water down flue. You might suggest that the fan be left running all night during the next rain, and check it in the morning - would eliminate 'tracing' to source.
Richard
 
Thanks, we will take another look-things like this drive me nuts. :eek:
 
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