The nor­mal oper­a­tion of the ven­ti­la­tion sys­tem involves ducts and ducts. But over time, debris can get into the shaft, the chan­nels can sim­ply become clogged with dust, which adheres firm­ly to their walls, espe­cial­ly if they have a greasy coat­ing. All this reduces the diam­e­ter of the air ducts, which neg­a­tive­ly affects the oper­a­tion of the entire ven­ti­la­tion sys­tem.

That is why many home­own­ers install spe­cial devices called deflec­tors on the heads of the ven­ti­la­tion pipes.

Features of the device

installed to increase draft in air ducts, mines and chan­nels. This device, deflect­ing the air cur­rents cre­at­ed by the wind, cre­ates a zone of low pres­sure at the out­let of the ven­ti­la­tion sys­tem. The air mass­es in the pipe, try­ing to com­pen­sate for the rar­efac­tion, rise to the head of the pipe, there­by increas­ing the draft.

This is a descrip­tion of the prin­ci­ple of oper­a­tion of all deflec­tors, of which there are a huge num­ber of designs. Many devices not only deflect air cur­rents, but also increase the speed of their pas­sage over the head of the ven­ti­la­tion pipe, by nar­row­ing the chan­nel, there­by sig­nif­i­cant­ly increas­ing the draft (air­brush prin­ci­ple).

Prop­er use of the deflec­tor helps to increase the per­for­mance of the entire ven­ti­la­tion sys­tem by up to 20%, it is espe­cial­ly use­ful on ven­ti­la­tion ducts with large hor­i­zon­tal sec­tions and bends.

In addi­tion, the deflec­tor on the ven­ti­la­tion pipe per­fect­ly pro­tects against the ingress of var­i­ous debris, small birds, insects, and most impor­tant­ly, atmos­pher­ic pre­cip­i­ta­tion. Basi­cal­ly, the mate­r­i­al from which these devices are made is resis­tant to cor­ro­sion. It is gal­va­nized or stain­less steel, ceram­ic or plas­tic.

Existing types of deflectors

To date, there are a huge num­ber of dif­fer­ent designs of such devices. Among them, the most pop­u­lar mod­els are:

  • — an effec­tive and sim­ple struc­tur­al device for redi­rect­ing the wind.
  • — also a very pop­u­lar deflec­tor design.
  • H‑shaped device for effec­tive increase of draft in ven­ti­la­tion and chim­neys.

In addi­tion, var­i­ous designs of open deflec­tors are often used both on the heads of ven­ti­la­tion and chim­neys.

Varieties of deflectors: 1 - Tsagi, 2 - Grigorovich, 3 - H-shapedAll vari­eties of mod­els can be clas­si­fied accord­ing to some dis­tinc­tive qual­i­ties:

  • Accord­ing to the shape of the top of the device.
  • Rotat­ing (rotary or tur­bine).
  • Deflec­tors-weath­er­vanes.

In addi­tion to such a com­mon mate­r­i­al as met­al, these devices are made of plas­tic. The plas­tic ven­ti­la­tion deflec­tor is less durable than its steel coun­ter­part, but has a low­er cost and a more sophis­ti­cat­ed appear­ance.

That is why plas­tic fix­tures adorn the ven­ti­la­tion shafts of most pri­vate hous­es. But he, besides the ser­vice life, has anoth­er seri­ous draw­back. Plas­tic does not tol­er­ate high tem­per­a­tures, so it is not rec­om­mend­ed to use it on chim­neys.

Weather vane - always in the direction of the windWeath­er­cocks — deflec­tors are usu­al­ly installed on chim­neys, but they are quite suit­able for ven­ti­la­tion sys­tems. The air flow, pass­ing through the sys­tem of peaks and slots in the body of the prod­uct, is redi­rect­ed due to which a zone of low pres­sure is cre­at­ed above the pipe. It should be recalled that the weath­er vane has such a design that allows this appa­ra­tus to be con­stant­ly turned, the work­ing side to the wind.

Rotat­ing due to its design not only enhances the draft in the ven­ti­la­tion shaft, but also effec­tive­ly pro­tects it from var­i­ous debris and insects. This device, as a rule, has a spher­i­cal shape, there­fore it stands out among all with its orig­i­nal design.

There is anoth­er orig­i­nal type of ven­ti­la­tion deflec­tor — rota­tion­al, or as it is also called tur­bine. This device con­verts the ener­gy of air flows into the rota­tion­al move­ment of the tur­bine, which spins the air, accord­ing to the prin­ci­ple of a tor­na­do, there­by cre­at­ing an increase in trac­tion in the duct. This device shows excel­lent results even in the warm sea­son, cre­at­ing trac­tion in the ven­ti­la­tion sys­tem.

Making the simplest do-it-yourself device

TsAGI deflector drawingDespite the com­plex­i­ty of the design, every home mas­ter can make a deflec­tor with his own hands. It is enough just to have the nec­es­sary tools and mate­ri­als. To make this device your­self, you will need:

  • A sheet of thick paper or card­board.
  • Sheet of gal­va­nized met­al.
  • Draw­ing of the deflec­tor with cal­cu­la­tions regard­ing the diam­e­ter of the pipe.
  • Riv­et gun.
  • Met­al scis­sors.
  • Drill with a set of drills.
  • Mark­er or scriber.

After prepar­ing the tool, mate­r­i­al and per­son­al pro­tec­tive equip­ment (glass­es, gloves), you can start mak­ing a ven­ti­la­tion deflec­tor with your own hands.

  1. First of all, you should trans­fer the con­tours of the prod­uct from the draw­ing to the met­al. There should be a sweep of all the main parts of the device: a cap, a dif­fuser, an exter­nal cylin­der, racks.
  2. After that, you need to cut out all parts of the device, accord­ing to the result­ing pat­tern.
  3. Con­nect all parts of the device, accord­ing to the draw­ing or sketch, using a riv­et gun.
  4. Con­nect the two parts of the deflec­tor using racks cut from the same met­al.

After man­u­fac­tur­ing, you can install the deflec­tor on the pipe head, care­ful­ly secur­ing it with clamps.

The deflec­tor will cre­ate addi­tion­al trac­tion in the chan­nels only if all its parts are made to a cer­tain size. It should be remem­bered that the instal­la­tion should be car­ried out while work­ing at height, so it is bet­ter to do this with two peo­ple and with insur­ance. If you are not con­fi­dent in your abil­i­ties, con­tact pro­fes­sion­als who have expe­ri­ence in the man­u­fac­ture and instal­la­tion of these nec­es­sary devices.

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