| Business | Phone |
| Air Filter Maintenance Co Inc 118 N Kresson St, Baltimore 21224 | (410) 563-4382 |
| Complete Air Filter Co 942 W Patapsco Ave, Baltimore 21230 | (410) 354-3325 |
| F C Clifford Inc 1101 Edison Hwy, Baltimore 21213 | (410) 732-1000 |
| Quality Air Inc 6309 Fort Smallwood Rd, Baltimore 21226 | (410) 355-3515 |
| Smokeeter 4145 Amos Ave, Baltimore 21215 | (410) 764-6700 |