How Is Boarding Kennel HVAC Designed for Clean, Healthy Air?

Sizing starts with the kennel's real occupancy, not the building square footage. The engineer counts the maximum dogs per run bank, multiplies by the target air-change rate, and converts run volumes to CFM per zone. A bank of twenty indoor-outdoor runs might need several thousand CFM of outdoor air alone, which pushes the project toward dedicated outdoor-air systems rather than standard rooftop units. Ductwork is sized for low velocity and even distribution, because a noisy, drafty register over one run and stagnant air in the next is a welfare problem the engineer prevents with careful diffuser layout. Filtration is specified to the building's ventilation strategy. Fully dedicated outdoor-air systems filter the incoming airstream once, typically at MERV 13 or better, and exhaust run air directly so pathogens never re-enter the supply. Where economics force some recirculation, the return path gets equivalent filtration and the engineer documents why the design still meets the facility's disease-control goals. Exhaust fans are selected for continuous duty and specified with grease- or moisture-rated components where washdown steam reaches them.

Pressure zoning is drawn zone by zone on the mechanical plans. New-intake and isolation runs run negative relative to corridors; general boarding runs run neutral to slightly negative; the lobby, offices, and retail run positive. Transfer grilles and undercut doors get sized so the required pressure differentials actually hold with doors closed, and the controls sequence verifies fan status before the system calls the zone satisfied. The engineer coordinates with the architect on door swings and gasketing, because a pressure scheme that leaks through hollow-core doors is fiction. Seasonal operation gets its own control logic. Summer economizer cycles that work beautifully in an office can pull humid, unconditioned air through a kennel when the building is already moisture-loaded, so the engineer writes the economizer lockouts and humidity overrides explicitly. Night setback is limited — dogs stay in the building overnight, so the system runs continuous ventilation even when the lobby goes to sleep, with occupancy-based trim only in truly unoccupied support spaces.

Use this checklist before the mechanical permit set is finalized: • Target air-change rate set per zone and converted to real CFM from run volumes and dog counts • 100 percent outdoor-air or high-ventilation strategy documented with the disease-control rationale • Pressure relationships drawn: isolation negative, lobby positive, run air never recirculated untreated • MERV 13 or better filtration on supply air; dedicated exhaust on each run bank • Dehumidification capacity sized to washdown and animal moisture loads, not just the cooling load • Heat or energy recovery on kennel exhaust for energy-code compliance • Economizer lockouts and humidity overrides written into the control sequence • Continuous night ventilation maintained in all animal-occupied zones