The lifespan of air filters

T=P/(N1×10-3 ×Qtη)
T - filter usage time
P - Dust accumulation of filter
N1- Dust concentration in the air before the filter (mg/m3)
Q - Air volume of filter (m3/h)
T - The daily running time of the filter (h)
η - Efficiency of the filter
Compared with imported filter paper (LYDALL), the biggest drawback of domestic filter paper is high hair removal and background dust accumulation, which is related to the production environment and process being less refined. In addition

Under common filtration rates, filter paper has high resistance, while super filter paper has higher resistance, which is more common.
Due to the high dust accumulation of domestic filter paper, its service life is not as long as imported filter paper.

N1=M(1-S)(1-ηn)+Nrs(1-ηr)
M: Atmospheric dust concentration
S: Circulating air ratio
Nr: Return air concentration
η n: Filter weight efficiency on the fresh air path before the filter
η r: Filter weight efficiency on the return air path before the filter
ηn=1-(1-η1)(1-η2)(1-η3)
ηr=1-(1-η2)(1-η2)(1-η3)