[TheForge] Electric Blower question

[TOOL GYPSY]

Hello all
    I installed an electric blower with a reostat on my forge. When on the 
lowest speed it is still running a bit to much air so i added an 
airgate.this works fine except the motor tries to compensate by speeding up 
a tad or three like a vacumn clener with your hand over the hose.My question 
is,  should i ignore this and see what comes of it.will this overheat the 
motor? or should i reroute the air to exhaust when the gate is closed ?
   Paddy P the wannabe

                                                          Nova Scotia  
Canada