A number of Dell Latitude 6430u Ultrabooks users have complained that their laptops “smell of cat urine”.

Dell engineers have ruled out biological contamination, and said the smell was not a health hazard.

The problem lay in the manufacturing process, which has now been changed, Dell said.

Users affected by the issue should send their laptop back for replacement parts.

Customers first raised the issue with Dell’s high-end business laptop in June.

“A few weeks ago I got a new Lattitude 6430u for work,” one user called Three West complained on Dell’s hardware support forum.

A number of Dell Latitude 6430u Ultrabooks users have complained that their laptops smell of cat urine

“The machine is great, but it smells as if it was assembled near a tomcat’s litter box. It is truly awful!”

Other users said they had blamed their cats for the smell.

Dell support technicians initially suggested that users should clean the laptop air vents with compressed air, but users complained that the odor persisted.

In September, a customer known as Malioz raised a concern that the cause of the problem could be to do with the polymer used in the laptop plastics, and asked whether chemicals causing the smell could be a health hazard.

After an investigation, Dell concluded that the odor was not hazardous to health.

“The smell is not related to cat urine or any other type of biological contaminant, nor is it a health hazard,” Dell support technician SteveB said.

The problem was related to the manufacturing process, and had now been resolved, he said.

“If you order an E6430u now, it will not have the issue.”

Dell recommended that users should send affected laptops away for a replacement palm rest and keyboard.