Heater Blowers

Are K11 heater blowers terrible generally, or do I have an issue to look into? The demisters work okay, but if you want to blast air onto your person, even on full power there's not much air coming out. Is this just a Micra thing?
if it's a facelift & had a pollen filter behind the glovebox it could be blocked full of dirt
Ah I didn't realise they had added filters to the facelift :) Seems a bit silly on Nissan's part that I had to cut out a panel to save removing half the dash to get to it, but I think this could be the problem :p