ASHRAE 62.1 Section 5.9 / OSHA 1910.94
What it means on the job
Industrial exhaust systems require adequate makeup air to replace the exhausted volume. A closed makeup air damper creates negative building pressure, reducing exhaust hood capture velocity and potentially causing backdrafting of combustion appliances. ASHRAE 62.1 and OSHA require balanced ventilation in industrial facilities.
Tested in 1 CraftIQ puzzle
- whats-wrongIndustrial Ventilation Deficiencies
Related ASHRAE sections
ASHRAE 62.1 — Ventilation
VAV boxes require an airflow measuring station (sensor ring or averaging pitot tube) to measure actual airflow for proper modulation. Without it, the controller cannot maintain setpoint.
ASHRAE 62.1 / Crestline BAS Specification
This CO2 sensor installation meets all requirements. The 0-2000 ppm range covers the full operating range needed for DCV (outdoor ambient of ~420 ppm to maximum occupied levels around 1000-1200 ppm). The ±30 ppm accuracy meets the specification tolerance. Mounting at 4 feet (breathing zone height) on an interior wall away from supply diffusers and doors ensures the sensor reads representative room air rather than being influenced by drafts or supply air.
ASHRAE 62.1 / ISO 14644-4
Clean room ductwork must NOT have internal fibrous liner. Fibers shed into the airstream and contaminate the clean space. Use smooth galvanized or stainless steel duct.
ASHRAE 62.2
Long flex duct runs with multiple bends severely reduce airflow. Each 90° bend in 4" flex adds ~15 equivalent feet of duct. This run has excessive pressure drop.
ASHRAE 90.1 — Insulation
Chilled water pipes MUST have vapor barrier on insulation to prevent condensation. Without it, moisture penetrates insulation, causes mold, and reduces R-value to near zero.
ASHRAE 90.1 / ASME B31.9
Chilled water piping insulation must have a continuous vapor barrier (vapor retarder) on the exterior to prevent moisture from migrating through the insulation and condensing on the cold pipe surface.
CraftIQ explanations are original educational commentary written in trade language and verified against the cited standards. Always confirm requirements against the code edition adopted by your jurisdiction — this is training material, not a substitute for the code book or your AHJ.