Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How many trays can I add to the four already with the machine and have it still work well?
Document: I spent many hours looking around on the internet for an inexpensive but well made dehydrator. I bought the Nesco FD-60 and it has lived up to my expectations. It is a lot easier to clean than other dehydrators I have used. It is also pretty quiet (not any louder than the average microwave). I have made fruit and beef jerky in it already and both have been great and finished very fast.
(They are absolutely beautiful peppers!) Their shape is so outstanding that I want to dry them whole, too. This 500-watt machine struggles to dry them.I know I would get better and quicker results if I bought a better dehydrator. I also think I would use it more often. So, I'm thinking about doing just that.It works optimally with at least four trays. Sometimes, I find it hard to fill up four trays at a time.
I wasn't sure if I was going to go all out into dehydrating my family's emergency food supply, so an entry level machine was perfect for me. I had a department store version that I used to prepare for backpacking trips but it was sounding like it had been dropped a few too many times over the years. The difference is remarkable. Love having the temp control so I can actually tell if it is doing the job right. Trays dry evenly and don't need to be rotated.
My old FD-50 gave out and I had 12 trays. So I got this one. I really like the fan on the top. It didn't sit well on my old trays at first, but after one use, everything fit together well. You still may need to rotate your trays, but I haven't found one where you really didn't need to do that.
I was new to dehydrating so didn't want to spend a ton of money on something I wasn't good at and not sure if I'd stick with. I found this dehydrator and the price grabbed me. This dehydrator has been very good to me. I've put things through this many, many times now and it's holding up beautifully. I've had no problems with it at all. I love that the air circulates well so I don't have to rotate the trays.
I love this machine. Fill it up and set the temperature and let it go. Does all the work of drying and not so noisy you can't get anything else done. I find it cleans up nice and isn't heavy. Completely happy with it.
Product does exactly as it states: Dries food. I dried all types of food using this machine (apples, kiwi, banana, etc) and they all came out dried and crispy. Still haven't tried drying meat, but I don't doubt that the machine can dry any food. The constant whirring and hum is audible while in operation, but it did not bother me. Similar loudness to a fan.
My American Harvest has finally passed away after 25 years of service..can u believe it!! With all the recalls on pet food nowadays, not to mention the cost, my pets only get jerky treats made from me!! I just take 90% frozen chicken breast, slice thinly! and process over nite ! Happy girls! Looking forward to getting my new machine & am hopeful to get many years of service..
This item works great and is a good value. I paid ~$50 and it is well worth the price. It has a adjustable temp. which is great for altering temps based on the food you which to dehydrate. If you wish to spend little and get alot, this product is for you. The reason I gave four stars instead of five, it does not have a timer shut-off. Overall &#8211; this is great for starters!
This was my second Nesco dryer. I dry tons of stuff and the first lasted for many years (until I forgot and let it run a couple of days straight and burned the motor up....my bad!) I've used up to 10 racks on this baby and it still works great (be sure to periodically rotate racks when using extras)! Recommend you use a plug in timer to shut it off so you don't burn it up like I did my last one!
Answer: The Nesco site says 12 trays total can be used at one time on this dehydrator.  I personally have used 12 with no trouble to dry several pounds of beef jerky.