When my furnace hanger-on kick on...? It 'pulls' the basement door shut, if it's moved out cracked open...

It 'pulls' the basement door shut, if it's moved out cracked open a bit, so evidently, air is individual pulled into the basement....

First...is this regular?

Second...does this mean I should walk out the basement door huge open for aeration...or keep it closed?
What is an environmentally friendly approach to combat...
Answers:    sounds approaching you don't have any cold nouns returns on the main floor
What does osb as it pertains to...
That's nil, we used to have this outdated furnace and whenever it kicked on, it would shoot flames out of it. (no joke) One night, me and my brother be playing and as he ran within front of it, a 2 foot flame almost caught his shirt on fire.