Motor for air exchanger fan

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2 yrs. ago we replaced the motor and it has now stopped working. I think we`replaced it with a unit (of smaller capacity). The specs on that replacement are: 115 v 60 hz 1.3 a 1550 rpm. Can anyone advise me as to a more appropriate motor - one with more powerful specs. The unit is a ConForMax - installed in our house approx 15-20 years ago. The size of teh actual motor is 3.25 inches in diameter and about 2 inches in depth. The fan that it drives is about 4.5 inches in diameter. My email address is jdelaney@mun.ca