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Ductwork
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Flexible Ductwork — Installation & Replacement
Quiet, efficient airflow starts with properly built flexible ductwork. We design and install UL 181–listed, R-8 insulated flex to ACCA/SMACNA best practices: sized by Manual D, sealed airtight, fully supported, and routed on the shortest, smoothest path.
What “done right” means
- UL 181 flex with R-8 insulation in attics/crawls (R-6 only where code allows)
- Runs sized to target CFM and acceptable static pressure (Manual D)
- Inner core fully stretched, smooth sweeps, bend radius ≥ one duct diameter
- Airtight collars/boots: mastic + UL 181 tape; inner core clamped with listed draw bands; vapor jacket sealed separately
- Supports every ≤4 ft with ≥1.5″ straps; minimal sag; no kinks or crushed sections
- Metal trunks/plenums where appropriate, with flex “whips” cut to exact length for quiet, balanced supply and return
Installation process
- On-site assessment — measure static pressure, map supply/return sizes, confirm routes and clearances.
- Design & sizing — Manual D layout, trunk strategy, register/return selections.
- Professional installation — cut to length, fully stretch and form arcs, seal cores and jackets, strap and insulate, label each run.
- Test & balance — verify system static, confirm room CFM and temperature split; adjust dampers for even comfort.
- Handoff — photo report, filter sizes, simple care intervals.
Why it matters
Correctly sized and sealed flex lowers energy use, reduces equipment strain, cuts noise, and delivers consistent temperatures to every room.
Wondering If We Cover Your City?
Our services are just as easy to schedule across multiple parts of the Bay Area. In the South Bay, we serve San Jose, Sunnyvale, Los Gatos, Saratoga, Campbell, Cambrian Park, Cupertino, Mountain View, Los Altos, Palo Alto, and Menlo Park.
On the Peninsula and the West Bay, we provide the same convenient support in Atherton, Redwood City, San Carlos, Belmont, Foster City, and surrounding areas. In the East Bay, we’re available in Fremont, Newark, Milpitas, and Union City—so wherever you are in our service area, help is close by and simple to book.
If you’re not sure whether we cover your neighborhood, just reach out—give us a call or submit a request online. It’s quick, easy, and completely free, and we’ll confirm availability and next steps right away.
Schedule a technician for an on-site duct installation or replacement visit: 510-400-6425.
Keywords: flexible duct installation, UL 181 flex, R-8 insulated duct, Manual D sizing, HVAC duct replacement, duct sealing and balancing.