The ventilation volume of the kitchen is [60m3/(h m2)], and the pipeline resistance (Pa) is calculated.

d=2ab/(a+b)

=2×0.3×0.5/(0.3+0.5)

= 0.375 m

V=Q/{(d/2)^2×3. 14×3600}

=( 17×60)/{(0.375/2)^2×3. 14×3600}

= 2.566 m/s

R=(λ/D)*(ν^2*γ/2)

=(0.0 154/0.375)*(2.566^2* 1.2/2)

=0. 16

H=RL

=0. 16× 13

= 2.8 Pa

Hw=ζ(V^2γ/2)

= 1.54×(2.566^2× 1.2/2)×5

= 30.4 Pa

Hz=H+Hw

=2.8+30.4

= 33.2 Pa

Firstly, choose an axial fan:

Model SFG2.5-2

Air volume 2 100m3/h

Pressure 150 Pa

Power 0.25kw

The rotating speed is 2800 rpm.

…………

Let's count these first. This is only part of the ventilation in the kitchen, that is, the kitchen must have a stove. How many/much? What is the height of the stove from the hood? ! Only by knowing these parameters can we accurately calculate the required fan parameters, otherwise such a large cross-sectional area of the pipeline is really wasted.