Eco Quest Fresh Air

Here is the blue glow I am talking about it is only noticeable with the room lights off

I found a perfectly working ECOQUEST Fresh Air machine and it has a G4T5 lamp in it. My question is I can see the blue glow from the front of the machine but It is blocked by a metal mesh filter is that still bad to look at? If it is I may replace the lamp with an F4T5 (The machine complains if I remove the starter or lamp) as I don't like the idea of me or someone else getting hurt from a UV lamp

Here is a link to the manual for the product (Adobe Acrobat PDF File)

Thanks