A newly installed York TM9T high-efficiency furnace emites a moderately noisy and constant high-pitched whirring sound similar to a vacuum cleaner or hair dryer when the blower is operating. It is loud enough that the customer's televison volume needs to be adjusted when the blower kicks in. The original blower motor was just replaced under warranty because of bad bearings. Strangely enough, the whirring sound occurred only after the new non-variable speed motor was installed. The sound seems to be originating from the furnace blower and is transmitted through the supply and return air ducts. Could the new motor be running at a different speed or rpm and generating too much air volume? The blower off delay is set at 120 seconds, the fan on speed is factory set at 30 seconds and the continuous fan speed is set at low.