Not much - much easier access to battery than any JT fans.
LOUD - like all the mask attached fan systems flawed concpet! Wish the designers wore glasses.
I'm the old man x-Nam Vet and Sr. Engineer. All the fans system that fit above the mask are flawed as they take in your hot moist body heat and blow it upon my glasses/mask lens. They are all LOUD killing stealth sniper hearing/OPs. It is usually HOT/humid where I play and no matter what I do I'm plagued with severe mask/glasses condensation. No, low air volume fan works including this one. All current fan systems stink as I suspect the designers do not where glasses just like I've found with mask makers not accommodating glasses wearing.
Do not buy - you'll be disappointed. Condsider placing the fan behind the users head (or on the belt - better) and use plastic >0.5" air-duct tubes attached to the head straps (to both sides) of the mask.This will remove most all the noise from near the face/ears. But you do not want to increase the rear weight on the head strap pulling the mask out of place on the users head. So place the battery in a belt pouch (allows for bigger 12V type battery) with an easy access 100% speed/powered control (like a blower voltage potentiometer). Use a 2.5-3" BLOWER not a 1" mini-fan that has NO CFM - get >10CFM into the mask over each eye.
2 out of 10
Last edited on Monday, May 29th, 2006 at 5:56 am PST