Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: How does the noise level compare to someone talking, for example?thanks
Document: the smells of the chemical  comes inside the mask and the fan blows too hard and the speed cannot be adjusted
Weight is not a concern if your work is looking downward, and becomes very noticeable if doing anything beyond looking straight forward. Easy on/off. And for those that have a beard, I sport a FULL one and find this unit seals without much problem other than occasional caught hair in the cinch... Battery pack can easily go 8 hours, charges overnight. Rather than replacing the filter after each use, I use the shop vac to clean out the unit.
This system cannot be beat for portability , ease of use and on board cooling air. I used this system for years doing mold remediation and it not only protects your lungs it also protects your face and especially your eyes.The  high efficiency filters are designed to be reused continuously until they will not pass the flow test with the flow meter that is included. The meter is used for several models so make sure you are setting it up for this particular system.
This is just a personal preference of mine.The filter membrane and the media used in it can be corrupted by trying to blow it out with an air hose, smacking it or using a vacuum. The filter is  safely designed around the power of the blower motor and  high pressure "fixes" can  damage the membrane  which compromises its' integrity and the ability to keep your eyes and lungs safe.The air blower delivers cool air to your face which prevents fogging but the mask will collect water after several hours.
The filter longevity actually makes it a very economical system if you need it on a regular daily basis and you are not an occasional user. The no-fog face mask and cooling air are a definite bonus.If you lay out the big dollars for this system take the time to read the manual carefully especially for the contaminants this will not filter even though it works for asbestos dust and lead.
Nice feature to check for flow or low battery, 3M has made a great unit here! 4 star for overall because of weight for anything other than looking down. Highly recommend for wood working.
I just stuff the pack in a rear pocket or in a tool pouch pocket. I like the rear pocket since I can route the power wire under a shirt and out of the way.The mask itself can be easily washed at the end of the day and don't forget to plug in your battery! !The negative side of this whole system is the high initial cost and the exorbitant  prices on replacement  component parts. This system is not cheap .
Getting into wood working in a big way purchasing a 100 year old town hall for my home. Milling wood taken out of my "Back yard" and the American Beechwood creates a LOT of dust. I needed to protect my lungs in a way that was beyond just a paper mask and I also needed to have fresh air flow because I tend to sweat a LOT and wanted to prevent fogging.
3M has an excellent respiratory protection selection guide at their website.The manual also  explains the seal tests either negative or positive method. I prefer the negative style and just cover the air inlet and breathe in. If the mask sucks in hard against your face and no air gets in you have a seal. The positive test of gently exhaling makes leak detection harder to detect from my experience.
Answer: no