Broan-NuTone 433 Automatic Aluminum Shutter for 353 and 35316 Gable Mount Attic Ventilator, 16.75" x 2.75" x 16.75"

I have a harbor freight 10X20 greenhouse that I dind't have vents because the ones that came with it were poor. I found this shutter online and thought I would try it. I am very happy with it. I simply cut out the hole in my greenhouse, and installed it. It is lightweight, but seems sturdy. Amazon overly packed the thing, so it arrived i perfect condition. I seen plastic ones as well, but after reading the reviews, went with the alum one. For the greenhouse I simply put a box fan up next to it, and installed house eve vents on the opposite lower side. This creates a nice flow. The air from the fan blows against the shutter and opens it. On nice feature is that the shutters are not connected, they operate individually, so you don't have to have enough air to push open the whole unit at one time.And in the winter, I plan on simply covering it with foamboard. I had looked at Home depot, and lowes, but for the money, this was well worth it!

I purchased the Broan 433 to replace a plastic shutter installed many years ago. The swivels for the louvers of the plastic shutter had worn quite a bit and when the fan was running caused a loud rattling noise that permeated my small house. The Broan 433 is easy to install, outperforms the plastic shutter with regard to the amount of open area for the airflow, and has eliminated the noise associated with the plastic shutter. Because the louvers of the Broan 433 are lighter and require less force to open them, I am confident that it will be a long time before the swivels wear out as did those of the plastic louvers.I highly recommend the Broan 433 based on quality construction, ease of installation, and performance.

I purchased this shutter along with the Broan 353 Gable Mount fan for installation in my garage. The temperature in my garage has been in excess of 100 degrees after my wife and I get home in the afternoon - two hot engines emitting heat inside the garage. And my neighbor has an attic fan in his garage, which he highly recommended. So the install of the fan and shutter were fairly easy, other than having to cut through a one inch depth of stucco. The shutter is very nice, other than what some of the other reviews indicated - they don't automatically close all the way, right away. It took a breeze to push them closed all the way. So I glued some one inch washers inside of each of the louvers, which was suggested in other reviews, and it works quite well. So other than having to manipulate them to close all the way consistently, I really like this shutter. Additionally, my neighbor recommend using Loctite Construction adhesive instead of screws/nails, due to my stucco application concern. Loctite worked great! I also used it to frame the shutters with some redwood that I painted white. I love the appearance of the shutter, and would recommend it.

My 8 year old house was built using a plastic louver vents at the gable ends. I live in sunny Florida so its important to provide thermostatically controlled fan power ventilation. The plastic louvers fell apart and I needed an upgraded replacement. The Broan 433 are close to the opening size. I received the shipment today and am very happy with the aluminum louver. The blades operate independently and smoothly. The units appear to be well constructed. I'll install the louvers this weekend and expect that these will provide superior service to the original plastic units and I doubt that I'll have to tackle this job again.

shutter is light and made well.works perfect for what i needed.but........the measurements cant be found for this thing on the site.the outer was like 19 and a half. the inner was 16 and a half.was expecting it to be bigger.i was useing it for and exhaust fan in my garage which was twenty four by twenty four.but it worked out fine.now with that said.most people are buying this for an attic fan which i also have.they are smaller. i got mine at lowes.this vent will work perfect for those.hope this helps.because i was in limbo trying to find the size cause it aint there.so here it is .outer dimesion is 19 1/2 by191/2 and the inner or the part that will go in the hole that your going to cut is 16 1/2 by 16 1/2.hope this helps every one.

This 4 louver vent works well. It has a sturdy mounting frame and well designed max opening stops. Simple. I used it to replace a broken plastic vent in a greenhouse. Added some eyelets and chain opener to open the louvers manually instead of going with the added cost of a thermostat and opener. This is exactly as pictured; gable vent, aluminum frame and louvers. One comment I appreciated by another reviewer was about the noise in the wind. I did have the same problem, as the vent was installed on the windward side of the building and did flap from time to time. I solved the issue by epoxing steel washers to the back of each louver to make increase the mass.