General manager Jack Johnson said most of the 20 employees of the hay exporter business would be moved to the company's South Australian plant to continue work.

As well as losing 2000 tonnes of hay the Horsham business lost loaders, forklifts and an x-ray machine used to check the containers before export.

Mr Johnson said the company was insured.

He said the company's hay export would be hampered by the closure of their Plumpton Road site.

"We're going to be closed down here for one to two months, until we start rebuilding the shed," he said.

"Most of the staff will work interstate and a couple will stay to help with the clean-up."

Mr Johnson said one positive to take from the fire was that firefighters were able to save the hay presser, a vital piece of equipment for the business.

"We will continue to produce in South Australia and then when we're ready go back to three shifts at Horsham," he said.

Mr Johnson said the employees were shocked and disappointed when they discovered the extent of the fire.

"The upside for them is that we've found them some work so they're at least going to be employed," he said.

"When they saw the fire the first thing they thought was there won't be any work for a while."