Problems with value and direction of the velocity

[MattHome98]

Good Morning,
My name is Matt and I'm new of this Community.
I've got a problem with FDS.

I've made a model of a room with: supply vents (in the surface of the roof), exhaust vents (in the down part of a surface wall) and open vents (there aren't window or door). In the middle of room there is a fire and 3 smoke detector.

The summary of my input file is:
.............
&HEAD CHID='Room', TITLE='Room1'/
&TIME T_END=1000/
&DUMP DT_SL3D=0.25/
........
&MESH ID='Mesh', FYI='corpo lungo', IJK=..................../

&SURF ID='M1', RGB=........,...., HEAT_TRANSFER_COEFFICIENT=0.0, VEL=-0.4/
&SURF ID='A1', RGB=51,204,0, HEAT_TRANSFER_COEFFICIENT=0.0, VEL=0.9/

&VENT ID='ma1', SURF_ID='M1', XB=1.5,2.1,3.4,4.0,2.9,2.9 , CTRL_ID='ControlMandate'/
&VENT ID='as1', SURF_ID='A1', IOR=-1, XB=8.7,8.7,26.8,27.5,0.3,1.5/
&VENT ID='ap1', SURF_ID='OPEN', XB=18.8,18.8,18.0,19.0,0.1,0.2/

Inside there are: 3 smoke detector, when at least 2 detector activate the supply vents run off:
&CTRL ID='ControlMandate', FUNCTION_TYPE='ALL', LATCH=.FALSE., INITIAL_STATE=.TRUE., INPUT_ID='2'/
&CTRL ID='2', FUNCTION_TYPE='AT_LEAST', N=2, INPUT_ID='S_1','S_2','S_3'/

&DEVC ID='S_1', PROP_ID='Smoke Detector 1', XYZ=2.5,2.5,2.9 /
&PROP ID='Smoke Detector 1', QUANTITY='CHAMBER OBSCURATION', ALPHA_E=1.8, BETA_E=-1.0, ALPHA_C=1.0, BETA_C=-0.8/
&DEVC ID='S_2', ............................................
&PROP ID=.................................
&DEVC ID='S_3', ..............................
&PROP ID=.....................................

I create a fire...

&TAIL /
When I run my file input in FDS, the software doesn't give me error.
When I look the data result in Smoke View, there are some velocity very high (>0.9) and the direction of velocity is opposite in the exhaust vent after the supply vent runoff.
What can I do?
Thanks for the help
Matt

[drjfloyd]

We would need a complete input file to be able to run and see what you are seeing.