Insights
Practical guides for general contractors, property managers, restaurant operators, and healthcare facility directors on California commercial mechanical code, SMACNA construction standards, OSHPD HCAI submittals, and public-works procurement. Written by the people building the work, not a marketing department.
Section 01
Code compliance
The two California code documents most-likely to hold up a mechanical permit: NFPA 96 on grease ducts, and Title 24 Part 6 on energy performance.
Kitchen Ventilation · Compliance
NFPA 96 grease duct requirements for California commercial kitchens
Hood types, 16-gauge welded grease duct construction, NFPA 96 clearances, UL 300 fire suppression, and the dual-permit workflow (building department + county health department) that catches most TI projects off-guard.
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Energy Code · Compliance
Title 24 mechanical code 2025 - what changed for California commercial buildings
The 2025 California Energy Code took effect January 1, 2026. The mechanical-scope changes that actually move on submittal sets: heat-pump prescriptive baseline, R-454B / R-32 refrigerant transition, expanded demand-controlled ventilation, tighter economizer triggers, HERS-verification scope.
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Section 04
Seasonal & operations
What California GCs, property managers, and restaurant operators need to know before peak summer heat - and how to select the right mechanical trade partner.
Preventive Maintenance · Seasonal
Commercial HVAC summer maintenance checklist - California property managers & GCs
Coil cleaning, refrigerant verification, capacitor inspection, filter intervals, and the April–May scheduling window that prevents $12,800 average summer shutdowns. California-specific guidance for Sacramento, Bay Area, and Southern California commercial buildings.
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Kitchen Ventilation · QSR Operations
Why restaurant HVAC systems fail in California summers - and what to do before July
50% of QSR makeup air units are already failing. The grease physics, ventilation imbalance cascade, and Sacramento 105°F ambient factors that combine to cause summer breakdowns - and the pre-season maintenance schedule that prevents them.
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General Contractors · Procurement
How California GCs choose a commercial mechanical subcontractor: 7 questions before you award
CSLB license verification, self-perform vs. sub-tier crews, reference call script, bonding capacity, DIR registration, and the California-specific compliance questions that separate experienced mechanical subs from ones who will learn on your schedule.
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More guides coming. If there's a California commercial mechanical topic you want covered - Title 24 Acceptance Testing, BAAQMD / SCAQMD permit timelines, refrigerant management under SB 1383, NEBB vs AABC TAB selection, anything else - email contact@sierramechcorp.com and we will write it.