Have a new Lennox gas furnace SLP98UH... what should the temperature of the exhaust gases be at the point where they exit the house?.

System has a Honeywell Visionpro TH8000 series thermostat... when the Fan is set to ON to run continuously, the blower speed is very low... how can the blower speed be increased?

Lennox manual says not to set thermostat below 60 degrees as this reduces the number of heating cycles and damage to unit may occur... what does this mean?.