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P-n-G,
There is nothing wrong with a North Respirator if it's comfortable and fits properly. The main thing with this type of respirator (half face negative pressure) is the fit. There is something called the positve/negative pressure fit test which should be performed each time you put the respirator on. First, put your hand over the filters (to create a seal over the filter cartridge opening) and breath in. The mask should collapse onto your face and your should not notice any leaks around the perimeter. Next, put your hand over the expiration valve (that's the round on between the filters) and breath out. The mask should push away from your face. If you blow hard enough, you will eventually break the seal.
Of course, it you really want to check for proper fit, a fit test can be performed in a controlled environment with a smoke tube by an industrial hygienist. But, that's probably more information than you want.
After each use, remove the filters and wash the mask with mild soap and water than let air dry. When dry, you can place the mask on a large ziplock bag to keep it clean until you need it again.
There are tons of information and requirements on proper use, storage and selection of respirators if you so a google search.
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