I crack both doors with mine. It pulls fresh air in one, and I point it toward the other on the far side of the garage...
However, mine needs a rebuild kit... After 23 years, it's having issues staying fired. Needs a new nozzle and fuel/air filter kit.
84 SVO Folvo, 03 Cobra suspension, steering, brakes, IRS
68 F100 Flareside, DOHC, M122, T45, CV IFS, Cobra IRS, 4.10s
96 Mark VIII, RPE chassis bracing, hub swapped