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Old 04-04-2013, 12:36 AM   #15
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Made these for my suburban, used #14 stainless screws to hold them in the center, cost $1.50 and 30 mins labor.
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Old 04-04-2013, 05:06 AM   #16
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One reason why commercially-available screens have a dome shape rather than being flat is called "equivalent opening size." By making them in a dome shape, you can make sure that the total size of the screen openings is as large or larger than the furnace exhaust opening. This ensures that the screen does not create an obstruction. The larger the mesh size, the smaller the dome shape needs to be to provide the right equivalent opening size.

The flat screens that 0557 made do provide an obstruction to the exhaust. The equivalent opening size is reduced by the wires of the screen. His screens may work for him, but as a mechanical engineer, I can't recommend it.
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Old 04-04-2013, 04:19 PM   #17
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They do work, and can be removed in the winter
when wasps are not building nests.
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Old 04-05-2013, 07:21 AM   #18
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They do work, and can be removed in the winter
when wasps are not building nests.
If you remove the screens before firing up the furnace, that's a different case. If you're going to do that, why use screen at all, when a solid metal cap will not only keep out wasps, but keep out water or dust as well? After all, you could remove a solid cap just as easily as you remove a screen.
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Old 04-11-2013, 07:51 PM   #19
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I typically use 3 inch foil tape for that
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Old 04-11-2013, 07:57 PM   #20
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I remember when reading the owners manual for the new Suburban I installed last spring that they specifically mentioned not to use screens over the intake and exhaust.

However, if one remembers to remove them before use it obviously wouldn't be a problem.
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Old 04-11-2013, 10:45 PM   #21
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There are three stainless steel replacement doors as options for the new Airstreams and a third party makes the bulbous screen shields to keep the wasps out of the gas appliances.
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Old 04-12-2013, 12:21 PM   #22
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Here is a place where you can order stainless steel screens. I need to do this soon. My furnance was almost completely blocked by mud dubbers nests.

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Old 04-12-2013, 02:03 PM   #23
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I put a dog flea collar in the opening every time I return from a trip.

Started this after a problem with mud dabbers never had a problem since using the flea collars. I think they keep out wasp also.
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Old 04-12-2013, 03:33 PM   #24
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I've used the standard screens you can buy in RV stores over the furnace and water heater for years without problems. The springs they come with are hard to connect, so I just attached them with mechanic's wire. That type of wire rusts and has to be replaced eventually. The springs can snap out of your hand and scratch the aluminum. The screens are overpriced, but so is everything else at RV stores.

I wish they made them for the fridge vent, and maybe they do at even a higher price.

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Old 04-12-2013, 03:59 PM   #25
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I cut a square of furnace filter...stays put until warm is needed.

Have forget'n to reinstall after use but WNY wasps are only good to 45mph, they couldn't keep up on the Thruway.

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Old 04-12-2013, 04:20 PM   #26
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Have forget'n to reinstall after use but WNY wasps are only good to 45mph, they couldn't keep up on the Thruway.

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