Duct Redesign and Air Balancing in Mar Vista for sleep, smoke, and room-by-room comfort.

Engineering duct redesign and air balancing for Mar Vista homes in CEC Climate Zone 6

Duct Redesign and Air Balancing planned by Breathe LA 365 in Mar Vista starts with one question: what is the room outcome the homeowner is actually buying? Once that is named, the equipment, the static pressure budget, the AHRI match, and the permit path follow. Airflow that supports a new heat pump, better filtration, and room-by-room comfort is the deliverable, not a brand name.

Engineering anchors for this scope: NEBB / TABB air balance tolerance: ±10% of design CFM at each register, ±5% at supply/return totals; Title 24 Part 6 §150.2(b) leakage targets at 25 Pa: full system replacement ≤15% nominal airflow, duct replacement only ≤10%, existing-duct extension ≤15% AND ≥60% reduction from pre-test; Visual and camera inspection of accessible ducts for crushed flex, missing insulation, disconnected boots, and unsealed plenum joints.

Average summer high near 76°F with winter low around 50°F at an elevation of 125 ft and roughly 3 miles inland. CEC Climate Zone 6. The cooling design temperature for Manual J calculations runs about 82°F, with typical Manual J load landing in the 450-650 sq ft per ton band. Every audit produces a written report Marcus signs.

Local audit pattern: Mar Vista 90066

Mar Vista projects center on retrofit work because most original 1940s-50s tract homes were built without central AC; the marine layer historically made it unnecessary. Climate change has made AC retrofits the dominant residential HVAC project in 90066. The Mar Vista Tract HPOZ protects Gregory Ain mid-century modern homes which require historic preservation review for any exterior HVAC component placement. North Westdale audits frequently find homes with rear ADU additions where the homeowner extended the floor plan but never extended the central system; ductless mini split for the ADU plus duct correction for the main house is a typical scope split.

Compatible equipment lines audited and installed: SMACNA standards, flexible duct ADC standards, sheet-metal trunk.

Code references that should appear in any quote you take seriously

Title 24 Part 6 applies to permit applications submitted on or after January 1, 2026. For duct redesign and air balancing replacement scope under §150.2(b), HERS verification of refrigerant charge, duct leakage (≤15% nominal airflow for full replacement, ≤10% for new ducts), and indoor airflow (≥350 CFM/ton) are required.

Permits route through LADBS. Mar Vista Tract HPOZ adds historic review for landmark blocks; standard counter permits 1–3 days. For Mar Vista homeowners, the rebate path runs through LADWP; LADWP separately lists qualifying heat pump rebates up to $2,500 per ton, while TECH Clean California reports HEEHRA single-family heat pump HVAC rebates fully reserved statewide as of February 24, 2026.

Read the Title 24 permit guide and 2026 rebate guide for the full breakdown.

Two failure modes Marcus has seen on duct redesign and air balancing projects

Adding a 5-ton heat pump on a duct system designed for 3 tons. Static pressure goes vertical, supply CFM falls below 350 per ton, equipment ramps but rooms get less air. The duct system has to come first.

Crushed flex duct discovered post-install when bedroom airflow is below 60 CFM despite a healthy system; the flex section was buried under blown-in insulation 12 years ago and never inspected Practical countermeasure: the audit measures static pressure first, supply CFM second, and writes the scope third — never the other way around.

Return-side leak through an unsealed cabinet seam pulls 18% of return air directly from the attic (130°F+ summer); cooling capacity drops, indoor humidity climbs, dust loads accelerate Practical countermeasure: every install includes commissioning readings on the close-out packet so the homeowner can verify the system is operating where the design said it would.

Get a written duct redesign and air balancing scope for your Mar Vista home

Booking dispatch handles permits, HOA paperwork, and crew scheduling. Marcus signs the technical scope. For Mar Vista addresses, that means submission through LADBS.

Call +1 (213) 805-8137 or open the booking widget. Lead with the room concern; the right duct redesign and air balancing sub-scope becomes obvious from the audit measurements.

Permits route through LADBS. Mar Vista Tract HPOZ adds historic review for landmark blocks; standard counter permits 1–3 days.