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PMSI Integrates a Promising New Mixing/Paddle Ceiling Fan

PMSI is distributing a new air mixing fan to help improve the method of re-circulating and cooling air. By combining an innovative fan design and optional attic damper with our advanced CIIIe (Command IIIe) features, PMSI can improve the minimum ventilation quality in the most challenging house designs. This new fan pulls air from the ceiling, optionally mixing it with a variable amount of attic air, and pushes it horizontally in all directions. It creates the opportunity for improved ventilation, stratification and house temperatures while providing a full-time way of mixing air in the house. Ventilation and air inlet management is a key to good air mixing in cold weather. In certain types of houses, integrating this tool with your existing well-maintained ventilation equipment can reduce production costs.

To visualize how this could improve air quality in your houses, imagine a swimming pool and the different cold and hot spots within this body of water. If you swim down deep, the water tends to be cooler than the top of the pool. If there was a way to mix the shallow water with the deep you would get a more balanced temperature throughout the pool. But is that enough to improve overall quality and temperature? Consider the swimming pool refill which adds fresh water to the existing water. Depending on the rate it enters the pool it may only affect the temperature of the zone directly in front of the return from top to bottom. A well designed pool filtration system sets up a gentle circulation and specifically mixes any refill water with the existing body of water. This demonstrates why mixing side-to-side would be necessary to affect the entire pool. In the same way, mixing warm air from the top-center of the house with cold air from the attic, then spreading it over the entire ceiling, provides the best payback.

Outstanding Air flow pattern improves air mixing
One distinction between larger houses with higher ceilings and smaller houses is the temperature difference between floor and ceiling air. At minimum ventilation, this condition has been traditionally managed by bringing the fresh air in at the ceiling level and pulling the exhaust air out using the lowest fans in the house. The result depends on the air inlets having a uniform position throughout the house when nearly closed. For example, a 1/8” deviation on a full length baffle that is open ¼” translates into a 50% variation throughout the house.

What if you could continuously re-circulate the air throughout the house and get even better mixing? The new potential solution is a mixing/paddle fan designed for the wider poultry house, which pulls air up through the fan and out toward the sidewall of the house by throwing air up to 60 feet. Combined with the actuated damper and chimney, fresh outside air is drawn from above and mixed with air near the ceiling before being introduced to the birds. Creating optimal air uniformity is essential for the best egg production.
If you are interested in further information, or wish to receive additional explanation regarding this fan or any of our products, please do not hesitate to contact me at or 616.340.8258.

Why are backup thermostats important?
Protect your flock against power failure or major ventilation system interruption. Heat and humidity levels during these conditions can rise rapidly and reach fatal levels within a matter of minutes. Set all backup thermostat settings carefully. Check and service back-up generators regularly.

What are the chances of your environmental control system failing? The statistical chances may be rare, but if failure does occur the consequences can be extreme if proper backups are not in place. You must be prepared with properly maintained backup systems to minimize loss. PMSI recommends both backup thermostats and an alarm system. The backup thermostat’s job is relatively simple and extremely important. For example, it takes over fan control staging if a computerized controller fails.

Basic Information about backup thermostats:
A backup thermostat is a mechanical device which operates separately from the PMSI system. It is essential that the backup thermostats be adjusted close enough to the set temperature to protect the birds. For example, if there is a failure in the equipment, the backup thermostats take over and control fan staging in temperature dependent groups. We recommend backup thermostats and fan stages with baffle override provision included. PMSI requires separate backup thermostats for fan stages, heater stages, baffle override and cool cell staging.

Where to locate:
1. It should be located in proximity to general airflow from the barn to be regulated
2. Avoid drafts of any kind
3. Avoid placing near inlets
4. Avoid placing near heaters

Backup Thermostat Testing
1. Verify that a fan thermostat can activate a set of fans by temporarily adjusting the current temperature. This should activate fans to stage “on”.
2. Check each thermostat using this process

Switched to automatic backup control:
PMSI uses backup thermostats, ventilation circuit breakers and relays to override the computer system when there is a problem

Motor Control Panels:
• A turnkey solution from the industry leader in poultry house automation
• Seamless integration between the Command IIIe system and the devices it controls
• Custom design and fabrication to precisely meet your needs
• High quality, cost competitive components selected for longevity and value
• Greatly reduced installation costs by electricians due to proper design and testing
• One single knowledgeable source for customer support and spare parts

Maintenance Checklist:
• Test backup thermostats for proper operation and temperature setting
• Circuit breakers: check to be sure not overheating, tripping (be sure you have replacements available)
• Lightning protection is properly installed
• Drives (fan belts), check belt tension, wear, etc.
• Clean Shutter and guards
• Clean motors

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