Tunnel ventilation and evaporative cooling are farm systems, not standalone products. Fans create airspeed and exchange heat; wet pads add evaporative cooling when outside conditions permit. Controls must protect bird welfare, litter condition and indoor humidity while responding to changing weather and flock needs.
What a farm designer needs to know
- House dimensions, construction, inlet arrangement and leakage
- Bird type, age, stocking density and production stage
- Design temperature, humidity and local weather extremes
- Fan performance at the expected static pressure
- Required airspeed and air exchange from the poultry specialist
- Pad thickness, face area and clean pressure data
- Pump, tank, header, filter and water-quality information
- Backup power, alarms and emergency ventilation plan
These inputs are interdependent. Adding more pad without confirming fan capability can increase resistance and reduce airflow. Increasing fan capacity without adequate inlet or pad area can create high face velocity, uneven wetting or water carryover.
Climate limits must be respected
Evaporative potential depends on the difference between dry-bulb and wet-bulb temperature. High humidity reduces the possible temperature change. A controller strategy may stage fans first and add water only when conditions and bird requirements justify it.
Never use a website efficiency percentage as a bird-safety guarantee. The farm's poultry consultant or ventilation engineer should define setpoints, alarm limits and emergency actions for the actual location.
Pad orientation and wetting
Install the pad according to the pad and system manufacturer's airflow orientation. The water header must wet the full top edge uniformly. Dry stripes reduce active area; excess water can waste pump capacity and contribute to carryover.
Check the wetting pattern before peak heat, after maintenance and whenever indoor temperature distribution changes. Keep the outside face free of feathers, dust, vegetation and packaging.
Water quality and hygiene
Evaporation concentrates minerals in recirculated water. Filters, sump cleaning and an appropriate water-management plan reduce blockages and deposits. Use only cleaning or treatment products approved for the pad, equipment, birds and workers. Farm biosecurity rules take priority during inspection and service.
When should poultry cooling pads be replaced?
Replacement is condition-based. Inspect for collapsed flutes, loose bonds, blocked passages, mineral loading that approved cleaning cannot remove, damaged edges and areas that no longer wet. Also check the frame and water system because bypass air or a blocked header can look like pad failure.
Record installation date, cleaning, water observations and pressure or airflow checks. Trend data is more reliable than replacing every pad on an arbitrary interval.
What local pad suppliers must manufacture consistently
Poultry integrators need stable dimensions, flute geometry, bonding and wet strength across replacement batches. The pad must fit the frame without large bypass gaps and perform within the system designer's assumptions. A factory should use documented quality-control checks and traceable materials.
Honeywell India supplies machinery for producing cellulose honeycomb pads; we do not replace the farm's ventilation engineer. Buyers planning local production can review the manufacturing line, calculate a preliminary capacity requirement and send their product matrix.