Holding(s) in Company

Porvair PLC
13 February 2007


LETTER TO : RNS
DATED:      13 February 2007



NOTIFIABLE INTEREST

We have been advised of the following holding by Impax Environmental Markets plc 
held in portfolios managed by them on a discretionary basis.

Registered owner                    No of shares                    %holding
                                    now

Nortrust Nominees Ltd               2,011,000                       4.96


LETTER FROM: PORVAIR
             CHRIS TYLER 
             COMPANY SECRETARY



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