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Housing

Heatwave puts piggery ventilation systems under pressure

PW ReportersBy PW ReportersAugust 7, 20142 Mins Read
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With temperatures recently hitting peaks of up to 32C inside piggeries, ventilation systems have been tested to their limits, according to environmental specialist Tim Miller of ARM Buildings. These temperatures have exposed a lack of maintenance as the major cause of poor performance.

Mr Miller has had to respond to a number of emergency call-outs triggered by the heatwave. Frequently he has discovered air inlets sticking or not opening fully due to stretched cables, fans not running at maximum capacity or not functioning properly because controls have been wrongly set.

“When there are four fans in a room or building and one fails, then you’ve lost 25% of your ventilation straight away,” he said. “In a two-fan room, it’s 50%.

“Sometimes, simple lack of cleaning is the prime reason for the problem. A build-up of debris can reduce a fan’s efficiency or even cause it to burn out. Similarly, caked-on dirt can cause adjustable air inlets to stick before they’re fully open.”

Automatically controlled natural ventilation (ACNV) systems that work well for most of the time can struggle in hot weather when there’s no natural air movement. ARM has found that installing roof-mounted ventilation stacks, with fans, can overcome this problem or simply adding fans to the chimneys that are usually present in ACNV buildings. 

Whatever their system, Mr Miller advised pig producers to check their ventilation carefully, or call in someone with knowledge of the control system and the effect changes have on the pigs themselves. On mixed farms with arable, this should be done before harvest as the pigs often get overlooked at this busy time.

When pigs are too hot, they simply stop eating and this means they fail to grow, which costs the producer money. This can be avoided by having the system thoroughly checked over regularly.

“On farms where piggeries are monitored, the problems can get picked up earlier – not just when temperatures reach a critical level,” Mr Miller said.

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