Model # 433

Internet #203481754

Broan 16.75 in. x 16.75 in. Aluminum Automatic Gable Square Mount Louvered Shutter Attic Vent


16.75 in. x 16.75 in. Aluminum Automatic Gable Square Mount Louvered Shutter Attic Vent

$4712 /each
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Frequently Bought Together

Product Overview

The Broan model 433 automatic shutter is the perfect accessory to Broan gable mount powered attic ventilators, provided you have adequate air intake on the opposite side of the attic or the in the eaves. Attic ventilation is critical to making any home more comfortable while helping to lower energy costs. Stagnant air can be removed, drawing fresh air across the surfaces. The home ventilating institute recommends at least one square foot of open air inlets for each 300 CFM of ventilator capacity.

  • Counter-balanced aluminum vanes open and close automatically with operation of fan
  • Steel reinforced for strength and durability
  • Weather-tight louvers keep attic dry year-round
  • Complete, easy-to-follow instructions for easy installation

Info & Guides

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Cut-Out Below Counter Depth (in.)
Cut-Out Left to Right Length (in.)
16.25 in
Net-Free Area (Sq. In.)
Product Depth (in.)
Product Height (in.)
Product Width (in.)


Color Family
Product Weight (lb.)
Screen Included
Thermostat Controlled
Ventilation Type

Warranty / Certifications

Manufacturer Warranty

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Customer Questions & Answers

Do the louvers operate independently or are they joined with some kind of metal wire device?

Do the louvers operate independently or are they joined with some kind of metal wire device? I'd be using these in an unconventional way, on a porch, is why I ask. I'd love it if the louvers were rigged to all work together so I could manually open and close the vents.
Asked by: studiopop
I think the force of the air generated by the fan blows and holds them open while its on. Then gravity shuts them when it stops.The bottom of the flaps are weighted so they go back to the closed position when no air is blowing on them.
Answered by: jimmy
Date published: 2017-04-04

Hello, how big will the CUT OUT hole be for this vent?

Product #433 Broan louver says its 16.75in x 16.75in... i just wanna make sure that when I cut my hole into the side of my house that I dont cut it to big and the louver just falls through the hole. So i need to know the size of the CUT HOLE in order to make sure the the edges can be screwed down. Thanks
Asked by: Anonymous
The vent is about 1/2" smaller than the rough-in size, depending on the type of siding you have and whether you intend to put trim around it, the size in the instructions may work for you. If you only want to run a bead of chalk around it when finished, I would go with 16.5"x 16.5". I made my opening prior to receiving the vent, used James Hardie plank siding, and put a small trim piece around the vent and butted the trim to the siding.
Answered by: Mark
Date published: 2016-07-01

Do the louvers go inwards to the attic?

Is this an intake vent and do you have it in a 12"x12" or 14"x14"
Asked by: Ray
Thank you for your questions. The louvers open outwards (to the outside). This is not an intake vent. This would be used with a cable fan that moves air out when in operation. While air is needed inside, this is not the intake. To be sure that your questions are properly answered, I would encourage you to contact our Technical Support Department at 888-336-6151 and speak with them directly. Thank you.
Answered by: NuToneCustomerSupport
Date published: 2017-06-14

Can I mount this like a gable vent, in that it will open when I turn on my whole house fan?

In other words, I want to use it without any ducting, or a dedicated fan to blow it open, just as an attic vent, mounted in a gable, to open when the whole house fan turns on. Thanks!
Asked by: Jose995
Yes, this vent does not need to be connected to a duct.
Answered by: CommunityAnswer
Date published: 2016-06-24
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Customer Reviews

16.75 in. x 16.75 in. Aluminum Automatic Gable Square Mount Louvered Shutter Attic Vent is rated 3.9 out of 5 by 14.
Rated 4 out of 5 by from The Shutter appears as advertised and I installed it. However, I wouldn't buy it again because th... The Shutter appears as advertised and I installed it. However, I wouldn't buy it again because the top louver "hangs up" and doesn't always close properly after the fan shuts off. My old shutter had a rod that connected the flaps and that always helped it to open and close evenly. I would defnitiely look for the other style the next time.
Date published: 2017-03-07
Rated 3 out of 5 by from Solid frame, louvers were a little tight and hang open at times. After some reworking the seem to... Solid frame, louvers were a little tight and hang open at times. After some reworking the seem to work better, but should not have to do that. Mounted with skirted screws and install went quick. Hope it lasts longer than the plastic one it replaced.
Date published: 2017-04-23
Rated 2 out of 5 by from Gable mounted louvered shutter This unit seemed to be very well built but after further inspection and installation I found it to be flimsy. I feel it could have been a bit more sturdy. After installation, which was done per instructions, I found that it doesn't close properly, the aluminum shutters are just too light in construction to weigh themselves closed when fan is not operated.
Date published: 2016-08-10
Rated 3 out of 5 by from Good product. Works well. But, not perfect Product works well and is easy to install. Louvers are light weight, so the air from my attic fan easily opens them. They also close quietly, again because they are light. All is aluminum, so they won't rust. My biggest problem was that the aluminum frame did not meet soundly in the mitered corners. There was a gap on each corner that would allow water to infiltrate if the vent is mounted so it is exposed to wind and rain. I used angle aluminum screwed on the outside of each corner to narrow the gap, then caulking to seal them. In the end it seems fine, but did require extra, unexpected effort.
Date published: 2014-07-08
Rated 4 out of 5 by from Good product! Product is good and would recommend it. You'll have to caulk the corners but that's no big deal (few gaps). Be-careful when handling due to it can be bent. I bent mine while screwing it to fan shroud but it was easy to re-straighten back out. I used mine for a solar attic vent. The fan I bought had a 20 watt solar panel which is not really strong enough to push the louvers completely open so I would recommend using a 40 to 60 watt solar panel. I went ahead and bought a 60 watt solar panel and it blows the lovers wide open! When using a solar fan, you have to keep in mind part of the pressure from the fan has to have enough force to push open the louvers and this will cause the fan to run a bit slower so that is why I recommend the larger wattage for solar use. If you are handy, you can buy a car radiator fan for $50.00 from online auto store, then buy a 60 watt monocrystalline solar panel for $105.00 at amazon. Find a remote controller from attic breeze or some other place and you're all set! Why spend $$$ when you can do it yourself!
Date published: 2014-09-24
Rated 1 out of 5 by from Poor quality Purchased for a shop squirrel cage fan. Unit has a fairly stout frame but needs to be sealed at corners and particularly at bottom or it will leak if exposed to weather. Frame also comes with pre-punched mounting holes that are ridiculously large, 1/4" x 1/2". This is larger than any pan head screws available at HD. Unit shipped to me had one vane that would not close completely and could not be completely fixed because one pivot end pin (which are friction fit and can not be removed) was not put in straight. My biggest objection is the vanes themselves are very flimsy. All vanes came fairly straight at top but all had curve at bottom which meant none close very well, with a gap in middle from 1/8" to 1/2". This unit will not keep out blowing snow or driving rain and should be re-designed and subject to better quality control.
Date published: 2016-09-14
Rated 5 out of 5 by from Louvered Attic Vent This was a good size for us to use with the attic fan installed. Happy it worked out, since we bought it through the website. Shipping took about a week. No complaints.
Date published: 2014-10-02
Rated 5 out of 5 by from Louvered shutter I installed this along with a new fan in my garage roof gable. Works alot better than the fixed vent I had. I would like to do the same to the house gable vent but I am concerned about birds and squirrels being able to gain access to the attic so I would add a wire screen to it.
Date published: 2016-07-19
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