Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: can it be used for horizontal mounting?? Will the louvres open/close?
Document: 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.
Durable aluminum shutter. Used to replace a plastic model previously installed that failed. Cost was quite reasonable versus home improvement store. Easy install for the do it yourselfer. No mounting hardware included with unit. Use pan head bolts or screws per your application.
This shutter was easy to install and very light. I recommend, if possible to not place this over a bed room. On days with high wind the shutters can open up and then close as soon as the wind dies and it sounds like someone is knocking at the door or the side of your house. I have noticed that after a few storms it looks like some of the shutters might be bending a bit which again would be related to the high winds.
The unit is very well built and arrived with no damage. The corners are reinforced and the edges have foam gaskets to insure a tight seal when closed. The shutters work flawlessly and open and close with no hesitation. It takes very little airflow to open the shutters fully and they close once the fan has shut off. I was initially going to buy the plastic shutter but the unit faces full sun for most of the day and I was concerned how long it would last.
This is a great little shutter, if i could make an improvement it would use a light spring to close, but it is quiet, well balanced and worth the money. And easy to install.
I liked the construction. They were well machined. The only improvement is to weight the louvers a bit. They are aluminum so don't always close tightly under their own weight. I'm considering adding stick on wheel weights to correct this, otherwise a great product.
Used to replace a plastic one every year that wind ddestroyed. This one will last for years, if not forever.
Fit was perfect and shuts great....used this with the gable mountedBroan fan....great combination. Used minimal caulk for a nice seal to theexterior wall.
Works well. We have used it for both attic vent and living space venting. If used for living space vent, you will want to make a winter cover to avoid heat loss.
Ok, its a good product. It works but the literature should have warned me that when used as recommended with the 35316 ventilator it may be to noisy for use on a dwelling. I have this product mounted on the gable about 14 feet above my bedroom window and it rattles like crazy and is absolutely too loud. I'm pretty irritated that I will have to undo allot of work to replace this with something else.
Answer: yes