Throttled direct vent termination

A horizontal direct vent termination for a vent system, the vent system having an exhaust section and an air intake section coupled to the termination, the termination comprising:

• an inner pipe and an outer housing, with a void formed between the inner pipe and the outer housing, the inner pipe having an exhaust region, the inner pipe and outer housing coupled to the vent system;
• an end cap at a first end of the outer housing, the exhaust region passing through the end cap to an exhaust opening;
• an intake region including one or more apertures having a closed periphery formed in the outer housing providing access to the void, the intake region formed a distance apart from the exhaust opening;
• and
• a throttle cover positioned on the outer housing to variably cover the intake region by being slidably positioned with a throttle guide at one of a plurality of positions partially covering the intake region, each of the plurality of positions providing a different level of air restriction over the intake region to thereby regulate air flow into the void, wherein said throttle guide comprises a slotted ladder having a center slot and three or more additional slots configured to set a position of the throttle cover with a pin engaging the center slot, each additional slot comprising one of the plurality of positions, wherein the center slot is further defined as a slot in a first direction and the three or more additional slots are further defined as three or more slots in a second direction, wherein the second direction is different than the first direction
• wherein the plurality of positions includes a first position where a total unrestricted area of the intake region is at least 35% of a cross sectional area of the exhaust region, and
• wherein the plurality of positions includes at least two different positions which occlude at least 10 percent of the unrestricted area of the intake region.

A direct vent termination for a vent system, the vent system having an exhaust section and an air intake section coupled to the termination, the termination comprising:

• a cylindrical inner pipe and a cylindrical concentric outer pipe surrounding the inner pipe to form a void between the inner pipe and the outer housing, the void adapted to provide intake are to the air intake section of the vent system;
• an end cap at a first end of the outer pipe, the inner pipe passing through the end cap and having an exhaust opening therein;
• an intake region formed in the outer pipe providing access to the void;
• and
• a throttle cover substantially free of apertures configured to be movably positioned and thereafter secured at one of a number of positions partially covering the intake region, each of the number of positions providing a different level of air restriction over the intake region using a throttle guide to thereby regulate air flow into the void, wherein said throttle guide comprises a slotted ladder having a center slot and three or more additional slots configured to set a position of the throttle cover with a pin engaging the center slot, each additional slot comprising one of the plurality of positions, wherein the center slot is further defined as a slot in a first direction and the three or more additional slots are further defined as three or more slots in a second direction, wherein the second direction is different than the first direction
• wherein the plurality of positions includes a first position where a total unrestricted area of the intake region is at least 35% of a cross sectional area of the exhaust region, and
• wherein the plurality of positions includes at least two different positions which occlude at least 10 percent of the unrestricted area of the intake region.