Allegro Industries 9903-D SAR Shield with Low Pressure Flow Adapter (OBAC Fitting), Standard

This is a good well made Supplied Air Respirator. It does not include a supply unit, it is just the helmet, hose, and an adapter to standard Air Line Quick Disconnect. This helmet fits well, is moderately comfortable (let's face it wearing a helmet is never like wearing a ball cap) and allows a clear field of vision when wearing it. Depending on you supplied air pressure you may want to remove some or all of the open cell foam in the hose. It's designed to be fed from a compressed air line with some pressure behind it. They use the foam to quiet/allow expansion for moderate flow rates etc. If you plan to hook this up to a belt mount PAPR type supply unit you will likely want to remove this foam. If you have a good pressure supplied air line from a compressor, let a LOT of it flow through to blow out the remaining solvent/plastic fumes from the foam mounting inside the hose. When you put this on at first the air coming through is loaded with adhesive solvent smell, and or residual odors from the open cel foam inside.On the Fit: I have a huge head (XXL motorcycle helmet size is tight), and this helmet fits me fine. I can wear safety glasses underneath it comfortably when putting it on so I don't have to bother removing them to don it in the shop. The helmet is easily adjustable to head size. There's a belt mount that's not the best quality, I made a small clip on holder for my normal leather belt/pants that I find works better, but the included hose support belt is adequate for occasionally use.Get yourself some of the adhesive lens protectors for this. They don't have the best adhesion, but a bit of blue tape on the edge keeps them on and they are sacrificial much cheaper items than the replacement lens. I find they let you work without fear of scratching up your very expensive PPE Helmet in the lab or workshop.

We do spray foam insulation. First of all the quality is very poor. I have to tape the adjustable knob to keep its position on the head strap. The plastic push rivets that hold the top half to the bottom together pop off all the time. The chin seal strap Velcro pop off, had to superglue them on. On my Supply air I have it turned up all the way, but there seems to be a restriction in the tube are upper assembly. I hardly get airflow. But the most disappointing thing is the lens. It’s made of the cheapest material possible. Don’t let any foam get on it. It virtually melts to the plastic. Use it for half a job and couldn’t see through it. FYI I did use the peel off Lin’s protectors, but they pop off within the first 10 minutes. Spray farmers use a silicone release spray specifically designed for the foam that we spray on our mask lens and that didn’t work. Will be ordering 3M versaflow mask! On a positive note after I modified All the parts it is very comfortable And works pretty good. I’m going to try something different with the lens. There’s a scratch resistance, clear plastic design for display counters, i’ll try to wrap that around the new lens.

The helmet leaks outside fumes returned the first 1 they sent a replacement same problem it leaks through the the front it needs a gasket or something to close the gaps between the clear plastic shield & the helmet so I had to use tape to seal it off but it's a poor design

Overall would be decent but the head-strap ratchet mechanism works so poorly the mask just won't stay on. The ratchet has so little tension that each time the head is moved it loosens one or two clicks. Very quickly the entire assembly is falling off. If you don't mind holding this with both your hands all the time it would be fine.