Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: I have a Sears variable speed whole house fan. There aren't any decora style fan controls for WHFs. Would this work?
Document: First, you will get the decora version of the switch as others commented. Before you order, make sure you want the decora version. I would have preferred the knob, but I am OK with the decora too since it matches my timer. I got this for a whole house fan. Since I am using a timer the "off" for this really not required. It really just like low speed setting for me. I would have preferred to just have a 2 speed switch (High and Low).
We had a really horrific-looking 2-speed switch in our home when we moved in. We changed all the switches in our house to decorator style switches, but had trouble finding one for our whole-house fan. This one looks and works great!
This switch does exactly what it is advertised to do. It is a 2 speed rocker switch for a Attic/Whole house fan. Very simple to install, especially if you are replacing an existing switch.I will note that I did not experience the same issue as another reviewer where the letter rubbed off after some use. It seems to be on there pretty good.
I received the second picture version as well - not the knob. The switch is a Leviton 3 position, single pole, 15A, white decora switch. It has the high, low, and off position printed on the surface. I am using this switch with my Air Vent Inc. 24' Whole House Fan 54301 Attic & Whole House Fan (which requires removing the prewired switch).The same switch without the wording was $60 from my local electrical supply and not available at Home Depot or Lowe's.
Not the rotary switch in the picture! This item is a push button, 2 speed, whole house fan control switch. Very easy to install and works quite well. I uploaded a picture so you can see what you will actually get. I think it looks better and is easier to use than the rotary switch it replaced.
The customers i installed this switch for loved it . matches the rest of the house with the white decora option and beats adjusting the fan speed with a chain.
Read all questions and verify you fan is either an Air Vent fan capable of this switch or can be re-wired for 2-speed operation. Many whole house fans cannot be re-wired. Also, the switch plus the wiring needs a device box large enough for the 3-wire plus ground connections and any additional connections for power.
A Decora device is so far out in left field I could not express my dissatisfaction enough to Air Vent. It had to be some executive with a comtemporary house that figures everyone needs white decors switches in their house that made the decision to change the product. For now I have ordered a 6-position switch and hope it will work. Stupid...stupid...stupid
Order this switch for the project that customer was going to signed in few weeks, not to delay job as need to change all the outlets and the switches in the house,Product arrived on time and I was happy that the job will be completed on time, but you better check the product even if its new, who knew.Long story short  the Low speed function on the switch didn't work. Worse, you can't return the defective switch after 30 days as the return policy expired.
I ordered this to put my whole house fan back to working order. When I bought my home I discovered that the fan had been covered with drywall. I ran the wiring and waited for the switch to arrive.Very happy with the switch. I can set the fan to high or low with no problems.
Answer: yes