Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: can this fan be mounted horizontally
Document: Like the other reviewers mentioned, the screws attaching the fan to the mounting bracket are poorly designed. If you use the mounting hole template even with the short screws, you will screw into the impeller with the 2 inner most holes. You can only use the 3 outside most holes and then you still have to be very careful.I got the fan mounted okay and it works well, but the instructions are very poorly worded and diagramed. they are written as if you are a professional installer.
The included screws are too long and hit the internal blades. This causes the blades to hit the screws inside and could have jammed the fan.
This fan makes the dryer run great ,ex. shorter drying time and installed a lint trap in line to help keep it from clogging up. If you aren't a duct installer you may want to hire one.
no more 3-4 hours drying jeans, my dryer is vented trough the roof and it's too much for todays dryers. Adding this fan has solved my problems! worth every penny if it continues to work for a reasonable amount of time.
we ran a completely new line for our dryer and incorporated this fan due to the length of the new line. if you open the dryer you can feel the fan pulling air- very strong! drying time is extremely decreased. the installation instructions aren't the best but a little common sense helps.
Guess the one built in to my dryer was very inefficient. I noticed that if the exhaust fan is not on, the pressure from the dryer makes the lint catcher pop out of the wall a little. In the summer when the attic is really hot, like 120 degrees, the exhaust fan may come on because it has a heat sensor in it.
Our dryer vent is approximately 50' adjusted length. Drying clothes usually took in the 60+ minute range. Now it takes about half the time. The booster fan installed easily and now allows the dryer to operate as it was designed. Purchase the fantech fc4 clamps to make it easier for future lint removal.
Great product so far, but I did have a little trouble after mounting it to the wall. I'm not sure where I went wrong but the self tapping screw that they sent me to secure the booster to the mount were to long and kept the fan blades from turning. Took the screw out and just used metal duck tape to secure it so far so good. It is quiet and does what it was advertised to do.
I measured the dryer exhaust run and installed the fan in the middle of the run. Install took more than three hours but this was definitely a custom install as I made some modifications along the way. A straight forward install with no modifications shouldn't take more than 45 minutes from start to finish including reading all of the directions. TIP:  Pre drill holes in fan before mounting and use rubberized hose clamps to make connections.
Bought this unit because my dryer run was more than 40' including two turns. Prior to installing this fan it took about an hour to dry a load of towels in a high efficiency dryer. It now takes about 40 minutes. It doesn't take a math whiz to figure the savings here! This unit is also very quiet and vibration free which was very surprising. It operates in ten minute cycles and uses less energy than a 100 watt lightbulb which also adds to the energy savings.
Answer: yes