Lambro Industries 143WP Lambro"dustries"dustries Plastic Under Eave Vent, 4In, White

Worked out for a under soffit dryer vent

My vent pipe exits beneath a bay window that extends out past the brick, and was previously just a hole covered with hardware cloth (thanks previous homeowner.) When I reconfigured the entire run, I opted to add this damper to eliminate the possibility of cold air coming back up the pipe. It does exactly what it's intended to do, as well as it possibly could (there's no rubber gasket or other tight closure so when closed it's far from airtight). The damper is a one-piece molded plastic flap that swings freely from two integrated pegs that protrude through the sides. If you have any plans to mount it with the 4" round inlet facing any direction but up, I don't recommend this product - gravity will help keep it closed in a position similar to that which is depicted, but don't count on it automatically closing in any other configuration; in fact it's likely that gravity will hold it open instead of closed if mounted with the inlet facing down or sideways. It's exactly as advertised, installs intuitively, performs well (when properly mounted), and has given me no trouble whatsoever. If you think this will fit your needs, pull the trigger.

The two consistent criticisms of this product are 1) the reduction in flow area and 2) the formation of ice that locks the flap closed. The flow area of the rectangular outlet is 70% of the circular incoming area, but of course this is further restricted by the partially open flap. Ultimately this may mean the air velocity doubles going through the outlet. Should you be worried? If you want to.The other problem can be addressed with care. To control ice formation, you want to control where water sits. Repel water from the flap area and make sure the flap moves freely and you greatly reduce the problem of freezing. I accomplished this as follows:1) I took the assembly apart into its three constituent parts.2) I recognized that the flap has smooth side and rougher side. I want the smooth side in.3) I made sure all the mold burrs particularly around the hinge point were removed.4) I used a spray silicon repellant, like those used to waterproof tents and boots, to apply a coat to the smooth side of the flap, the lip of the main piece, and a strip along the front of the top. The goal is not to apply silicon indiscriminately, rather I shielded most of the piece while applying silicon to the front surface near the interface with the flap (the plastic pieces are all particularly smooth here too, presumably to control moisture in this area). The goal is not to make water bead up everywhere, but to bead up and move away from the this front edge area.5) Finally, after several coats, I reassembled the unit. When I went to install it, I noticed that top of the front of the box tended to pinch the door at its hinge point, so I was careful to install the screws on either side to pull the front apart and ensure free flap movement.Just going into winter, so I can't tell you whether this worked, but I can say that water beaded up in the area near the flap.

Had been staring at my cracked and busted soffit fan exhaust vents for a couple years now and just hadn't gone up to replace these. I finally said enough looking and took a chance on these. They were a perfect match, made in the USA, and installed easily. I was done in twenty minutes replacing both of them 30' up on the ladder. I wish they would have come with screws, but for the few bucks these vents were, no big deal. Just took a little more care to not lose the old screws when I was up on the ladder.

I bought two of these to install two 2nd floor bathroom vent lights. They are allPlastic no springs or mechanized closing system. The plastic flap just closes by gravity. The flap works well and if you install it level there is no gaps between the flap and the housing. I have a low pitch roof and short eve and so needed something that would fit and have room for the vent line. Installation was simple. Before I decided to go with the eve exhaust vent I did a lot of research on eve vent vs roof vent and here in New England where we get over 1 foot of snow on the roof, it does not make sense to do a roof vent to me. Based on other reviews people are saying that the flap can get condensation and freeze shut in winter and based on other review suggestions I did put some silicone grease on the flap and housing edge to help repel the collection of moisture at that spot so will have to see how well this will work in winter.

If installed on uneven surfaces and perfectly squared, the liver does not close properly. It is made of cheap plastic.

Since I needed a small soffit vent, the big stores only have one to choose from. Didn't like the look, besides it was too big. So off to Amazon to save the day.I came upon these guys, simple plastic louvered door for soffit mounting. They are low profile and do the trick of venting. Like other reviews stated, no screws so make sure you have on hand four for each cover. Predrill pilots in soffit especially if you fall on a groove. If the screw wants to pitch towards the inside, I had one that started making the door hang up. I removed and sent it away from the vent frame, and perfect. I drilled a 4 1/8" hole and install was about ten minutes.