Ventilation pipe plug

Abstract

A ventilation-pipe plug includes a tubular sleeve having a sleeve outside periphery smaller than a ventilation pipe inside periphery. The sleeve includes an inlet end for receiving a gas and a hollow head attached to an end of the sleeve opposite the inlet end to allow the gas to flow from the sleeve into the head. The head includes a head outside periphery larger than the sleeve periphery diameter. The head also includes a plurality of passageways sized to allow egress of the gas from the head and to prevent ingress of animals and debris into the head.

What is claimed is:  
     
         1 . A ventilation pipe protector comprising: 
 a tubular sleeve having a sleeve outside diameter smaller than a ventilation pipe inside diameter, the sleeve comprising an inlet end for receiving a gas;    a hollow head attached to an end of the sleeve opposite the inlet end to allow the gas to flow from the sleeve into the head, the head having a head outside diameter larger than the sleeve outside diameter and comprising a plurality of passageways sized to allow egress of the gas from the head and to prevent ingress of animals and debris into the head.    
     
     
         2 . The ventilation-pipe protector of  claim 1 , wherein the head comprises a convex shaped end opposite an end of the head attached to the sleeve.  
     
     
         3 . The ventilation-pipe protector of  claim 1 , wherein the head comprises a peaked end opposite an end of the head attached to the sleeve.  
     
     
         4 . The ventilation-pipe protector of  claim 1 , wherein the head outside diameter is larger than a ventilation pipe outside diameter.  
     
     
         5 . The ventilation-pipe protector of  claim 1 , wherein the sleeve comprises a plurality of passageways sized to allow the gas to flow from the ventilation pipe into the sleeve.  
     
     
         6 . The ventilation-pipe protector of  claim 1 , further comprising a washer disposed around the sleeve and abutting the head, the washer comprising a washer inside diameter larger than the sleeve outside diameter and smaller than the head outside diameter, and an outside diameter larger than the ventilation pipe outside diameter.  
     
     
         7 . A ventilation pipe protector comprising: 
 a tubular sleeve having a sleeve outside periphery smaller than a ventilation pipe inside periphery, the sleeve comprising an inlet end for receiving a gas; and    a hollow head attached to an end of the sleeve opposite the inlet end to allow the gas to flow from the sleeve into the head, the head having a head outside periphery larger than the sleeve outside periphery and comprising a plurality of passageways sized to allow egress of the gas from the head and to prevent ingress of animals and debris into the head.