Duct piping is almost custom made for pigeons to nest and roost on and foul down from and it creates and awful lot of problems for commercial premises including a health and slippage hazard for staff.
Pigeon fouling is a vector for some really very nasty bacteria and pathogens – a carrier of some 60 known diseases – see https://britishbirdcontrol.co.uk/pigeon-guano-and-disease/.
Queenswest Shopping Centre in Cardiff couldn’t be doing with it any more and called us in to net off the ducting with a bespoke 50mm pigeon netting system.
As you can see it was a complicated job, completed expertly by IPAF qualified bird proofing term leader Craig Anderton.