Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Does the fan run continuous or only when it is dehumidifying ??
Document: Does everything I needed with a good feature set - auto power off recovery, continuous dehumidification capability, continuous drain. It uses a bit less power than stated - saw about 640w (using a dranetz power visa) at normal fan speed. Cant tell on longevity yet - I've only had it in operation for about 3 months. Overall very satisfied.
Due to an unusually wet 1667 sq ft basement, added an addional SPT SD 71E to the one that's been doing an exception job for three years. Original SPT-SD fourth dehumidifier purchased in the past and BY FAR the VERY BEST. Unit operates 24/7 on a continuous setting/high fan doing a perfect job. IMPRESSED !
I've gone through numerous dehumidifiers across the years. Each one seemingly less reliable or generally a worse product than the preceding one. This SPT dehumidifier is a gem among all of the others.It is quiet. The fan does NOT run constantly. It produces a lot of water. It does NOT produce any hot air.
I've used it several times since I purchased it and it certainly lowers the humidity in an area in a relatively small amount of time. It is powerful and like most dehumidifiers, it's loud, but not like an airplane loud...just as noisy as a fan would be. It's tolerable for the short amount of time I have needed to run it to keep the humidity down in my apartment.
Again, I figured this was strange but might be okay if the fan still needed to cool the motor. This week, however, I came home to find the machine reading a humidity of 30, which never happens, especially on cloudy days. I hit the power button, and the motor continued to run and even got LOUDER. It sounded like a jet engine taking off, but with a buildup that was slowed down to take several minutes. I had to unplug it.
SPT tech support offers no guidance other than to return the unit, so I'm returning it again. If you need continuous draining, save yourself some hassle and buy another brand.
Continuous drain feature was a must for me. Quickly dried a 600 sq ft basement area and keeps it at about 30% RH. Cycles on and off, unlike others I checked before buying. Much quieter than my last (Kenmore) unit.
The features like auto on/off, thermostat (humidostat? ), turbo speed, timer function, etc., made us to decide to go with as many features possible so that we could customize based on our need. Additionally, the price was a big factor--this is a good value.When the product arrived, we turned it on continuous for the first 48 hours...and emptied the bucket 2x in the first 6 hours!
I wouldn't say it's totally quiet but the noise is mostly from the fan.
I use the Dehumidifier in my basement. Heavy rain load this year, and noticed dampness and early mold for the first time in 12 years. Product decreased the humidity in my large basement by 10% in the first few hours. Not very loud on the Turbo (high) fan setting. Very pleased with the results
Answer: It will run while its dehumidifying and for a few minutes after the compressor shuts off; unless you have it on continuous mode.