Duct Redesign and Air Balancing planned for Tarzana living patterns and microclimate
Duct and return improvements for uneven rooms, dust bypass, oversized equipment, and weak airflow. That framing matters in Tarzana because the local building stock and code path push the scope in specific directions. duct condition, electrical readiness, condenser clearances, and filter cabinet upgrades before dense filtration The audit names the constraint in writing before the proposal lands, so the homeowner knows whether they are buying equipment, duct work, electrical capacity, or all three.
Manual D total external static budget allocates 0.50 in. w.c. for PSC blowers, 0.80 for ECM. Friction rate FR = (TESP × 100) / Total Effective Length runs typically 0.06–0.10 in. w.c. per 100 ft. Return-air free-area rule is 144 sq in (1 sq ft) net per ton. NEBB / TABB air balance tolerance: ±10% of design CFM at each register, ±5% at supply/return totals.
Marcus Reyes, P.E. runs the load calc, the static pressure budget, and the AHRI match in a single engineering pass. Average summer high near 93°F with winter low around 45°F at an elevation of 679 ft and roughly 15 miles inland. CEC Climate Zone 9. The cooling design temperature for Manual J calculations runs about 104°F, with typical Manual J load landing in the 350-450 sq ft per ton band. The written report carries his signature and the supporting measurements.