A Chicago Blower listing, from the manufacturer's published data.

Units: SI · US customary

Published specification

Design air flow	16.94 m³/s
Input power	55.86 kW
Static efficiency, on input power	60%
External static	1993 Pa
Pressure at the design flow	2033 Pa
Fan curve	25 points
Input-power curve	25 points

Manufacturer's product page

Open this part in the app — as a component of its own, carrying the catalog's figures; or open the builder and pick it from the catalog picker. The solver runs it with the catalog's own data, at your design point or across a year of weather.

Same family

How the model reads against this maker's data

Fan power through the fan laws, one curve per fan from a US multi-rating table

3 760 cells over 19 fans; none withheld

every cell's BHP within 2 % plus half the step it is printed to (0.005 BHP, 0.05 on the sizes printed to the tenth; the worst at 0.86 of that band) and its speed within 0.38 %, read back by the solver's own fan-law solve; RMS 0.44 % on power over the 3 648 cells where half the printed step is at most 1 %. The pressure curve is fitted at degree 7, the least that holds every cell: these tables print each speed up to the fan's pressure peak, where degree 5 breaks 47 cells of eight sizes. The bulletin's own figures come back through the listings: its worked example (the 135 at 2 600 CFM and 3 in., 3 152 rpm on 2.39 BHP) and its quick-selection chart's pick of a 330 for 8 000 CFM at 2 in., the best static efficiency of every size whose printed 2 in. column spans the duty. The bulletin prints no motor, so a listing's input power rests on an assumed one: its BHP over the federal minimum efficiency of the smallest motor that carries its curve at its top speed, which the listing's name gives as assumed ("20 HP motor assumed" on the 182)

From the validation page; every row is held by a test.

Listed from published data; a listing's figures are the manufacturer's, the model that runs them is ours. Solver results never depend on who has claimed what.