711 BIM collections found from 45 manufacturer(s) in United States Of America
TBE-STBA type 400
Backflow protection unit TBE-STBA
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
RAMINEX
Scarica
InoxPres Uniko 179
Pipe bridge
Conforme a EMCS
.RFA
Raccordo per uso meccanico
Raccorderie Metalliche Spa
Scarica
AESPres Uniko 679-002 Uniko
Pipe bridge FF
Conforme a EMCS
.DWG .RFA .IFC
Raccordo per uso meccanico
Raccorderie Metalliche Spa
Scarica
Pipe bridge FF 679-002 Uniko Gas
Pipe bridge FF
Conforme a EMCS
.DWG .RFA .IFC
Raccordo per uso meccanico
Raccorderie Metalliche Spa
Scarica
Pipe bridge MF 679-001 Uniko
Pipe bridge MF
Conforme a EMCS
.DWG .RFA .IFC
Raccordo per uso meccanico
Raccorderie Metalliche Spa
Scarica
Pipe bridge MF 679-001 Uniko Gas
Pipe bridge MF
Conforme a EMCS
.DWG .RFA .IFC
Raccordo per uso meccanico
Raccorderie Metalliche Spa
Scarica
KE KELIT STEELFIX C-STEEL
KE KELIT STEELFIX C-STEEL
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KELOX ULTRAX
KE KELIT KELOX ULTRAX
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KELOX PROTEC
KE KELIT KELOX PROTEC
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KELOX PPSU
KE KELIT KELOX PPSU
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT CLIMATEFIX
KE KELIT CLIMATEFIX
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT COPPERFIX
KE KELIT COPPERFIX
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT STEELOX
KE KELIT STEELOX
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KETRIX
KE KELIT KETRIX
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KELEN PP-RCT LX-SENSO
KE KELIT KELEN PP-RCT LX-SENSO
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KELEN PP-RCT
KE KELIT KELEN PP-RCT
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT STEELFIX STAINLESS STEEL
KE KELIT STEELFIX STAINLESS STEEL
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
KE KELIT KELOX PPSU-W
KE KELIT KELOX PPSU-W
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
KE KELIT
Scarica
TX-W-G05-Y
High efficiency water cooled chiller
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
i-FX2-W-G04-0632 (R1234ze)
High efficiency water cooled chiller with refrigerant type R1234ze
Climaveneta
i-FX2-W-G04-0632 (R1234ze)
High efficiency water cooled chiller with refrigerant type R1234ze
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
FX-W-G04 0551 - 2002 (R1234ze)
Water cooled chiller with refrigerant type R1234ze
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
NX-W-1204 (R410A)
Water cooled chiller with refrigerant type R410A
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
MAG 110 MA Dirt and Magnetite Separator + Airvent
Dirt and Magnetite Separator with Cu22, Cu28, ¾" and 1" connection
PN10, Max Kv [6,3 …7,5 M3] , Brass, Swivel design, including Airvent
TTM Energiprodukter AB
MAG 110 MA Dirt and Magnetite Separator + Airvent
Dirt and Magnetite Separator with Cu22, Cu28, ¾" and 1" connection
PN10, Max Kv [6,3 …7,5 M3] , Brass, Swivel design, including Airvent
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
Airvent Lateral
Valvola sfogo aria con scarico laterale
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
TTM Energiprodukter AB
Scarica
SHUNTOMATIC V (Heating)
Unità di circolazione / unità di derivazione / gruppo pompa, prefabbricato e pronto all'uso plug-and-play per applicazioni come radiatori, sistemi di ventilazione e riscaldamento a pavimento Temp. intervallo: +5 – +110 °C, max. pressione: 1,0 Mpa.
TTM Energiprodukter AB
SHUNTOMATIC V (Heating)
Unità di circolazione / unità di derivazione / gruppo pompa, prefabbricato e pronto all'uso plug-and-play per applicazioni come radiatori, sistemi di ventilazione e riscaldamento a pavimento Temp. intervallo: +5 – +110 °C, max. pressione: 1,0 Mpa.
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
TTM Energiprodukter AB
Scarica
SHUNTOMATIC MINI SHUNT Unit
Gruppo di circolazione / gruppo di derivazione / gruppo pompa, prefabbricato e pronto all'uso per applicazioni come impianti a radiatori, ventilazione e riscaldamento a pavimento, con isolamento termico. Temp. intervallo: +5 – +110 °C, max. pressione: 1,0 Mpa.
TTM Energiprodukter AB
SHUNTOMATIC MINI SHUNT Unit
Gruppo di circolazione / gruppo di derivazione / gruppo pompa, prefabbricato e pronto all'uso per applicazioni come impianti a radiatori, ventilazione e riscaldamento a pavimento, con isolamento termico. Temp. intervallo: +5 – +110 °C, max. pressione: 1,0 Mpa.
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
TTM Energiprodukter AB
Scarica
Airvent Automatic
Valvola sfogo aria automatica diritta per alta pressione, attacco 1/2" F
TTM Energiprodukter AB
Airvent Automatic
Valvola sfogo aria automatica diritta per alta pressione, attacco 1/2" F
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
TTM Energiprodukter AB
Scarica
SHUNTOMATIC K (Cooling)
Unità di circolazione/unità di derivazione/gruppo pompa, prefabbricato e pronto all'uso plug-and-play per applicazioni di raffreddamento come sistemi di ventilazione e raffreddamento a pavimento isolati con AF/Armaflex AF-2 di serie. Temp. intervallo: -20 – +80 °C, max. pressione: 1,0 Mpa.
TTM Energiprodukter AB
SHUNTOMATIC K (Cooling)
Unità di circolazione/unità di derivazione/gruppo pompa, prefabbricato e pronto all'uso plug-and-play per applicazioni di raffreddamento come sistemi di ventilazione e raffreddamento a pavimento isolati con AF/Armaflex AF-2 di serie. Temp. intervallo: -20 – +80 °C, max. pressione: 1,0 Mpa.
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 210 HSI Hydraulic Separator Insulated
Connection DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 10 - 150 m3/h, fully insulated
TTM Energiprodukter AB
MAG 210 HSI Hydraulic Separator Insulated
Connection DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 10 - 150 m3/h, fully insulated
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 210 HS Hydraulic Separator
Connection DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 10 - 150 m3/h, NOT insulated
TTM Energiprodukter AB
MAG 210 HS Hydraulic Separator
Connection DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 10 - 150 m3/h, NOT insulated
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 120 C Dirt, Magnetite and Air, Combi Separator
Dirt, Magnetite and Air Combi Separator with Cu22, Cu28, ¾", 1" and 1¼" connection
PN10, Max Kv [8,7 …13,9 M3] , Brass, Swivel design
TTM Energiprodukter AB
MAG 120 C Dirt, Magnetite and Air, Combi Separator
Dirt, Magnetite and Air Combi Separator with Cu22, Cu28, ¾", 1" and 1¼" connection
PN10, Max Kv [8,7 …13,9 M3] , Brass, Swivel design
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 120 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with Cu22, Cu28, ¾", 1" and 1¼" connection
PN10, Max Kv [8,7 …13,4 M3] , Brass, Swivel design
TTM Energiprodukter AB
MAG 120 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with Cu22, Cu28, ¾", 1" and 1¼" connection
PN10, Max Kv [8,7 …13,4 M3] , Brass, Swivel design
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 110 A Air Separator
Air and Microbubble Separator with Cu22, Cu28, ¾" of 1" connection
PN10, Max Kv [6,3 …7,5 M3] , Brass, Swivel design
TTM Energiprodukter AB
MAG 110 A Air Separator
Air and Microbubble Separator with Cu22, Cu28, ¾" of 1" connection
PN10, Max Kv [6,3 …7,5 M3] , Brass, Swivel design
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 210 MI Dirt and Magnetite Separator, Insulated
Dirt and Magnetite Separator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, with insulation
TTM Energiprodukter AB
MAG 210 MI Dirt and Magnetite Separator, Insulated
Dirt and Magnetite Separator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, with insulation
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 210 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, without insulated
TTM Energiprodukter AB
MAG 210 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, without insulated
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 210 AI Air Separator, Insulated
Air and Microbubble Separator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, with insulation
TTM Energiprodukter AB
MAG 210 AI Air Separator, Insulated
Air and Microbubble Separator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, with insulation
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 210 A Airfilter
Air and Microbubble Seperator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, without insulated
TTM Energiprodukter AB
MAG 210 A Airfilter
Air and Microbubble Seperator with DN 50 - DN 150 Flange
PN 10, Max recommended flow rate Q 9,2 - 89,8 m3/h, without insulated
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 160 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with ¾", 1", 1¼", 1½" or 2" connection
PN10, Max Kv [13,2 …73,1 M3] , Brass
TTM Energiprodukter AB
MAG 160 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with ¾", 1", 1¼", 1½" or 2" connection
PN10, Max Kv [13,2 …73,1 M3] , Brass
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
MAG 110 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with Cu22, Cu28, ¾" and 1" connection
PN10, Max Kv [6,3 …7,5 M3] , Brass, Swivel design
TTM Energiprodukter AB
MAG 110 M Dirt and Magnetite Separator
Dirt and Magnetite Separator with Cu22, Cu28, ¾" and 1" connection
PN10, Max Kv [6,3 …7,5 M3] , Brass, Swivel design
Conforme a EMCS
.DWG .RFA .IFC
Separatore per uso meccanico
TTM Energiprodukter AB
Scarica
FX-W-G05-0551 - 1752
Water cooled chiller with refrigerant type R513A
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
FX-W-G01 0551 - 1752 (R134a)
Water cooled chiller with refrigerant type R134a
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
FX-W-G04-Y-0651
Chilled water production group, water/water with refrigerant type R1234ze
Climaveneta
FX-W-G04-Y-0651
Chilled water production group, water/water with refrigerant type R1234ze
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
NX2-W-G06 0042 - 0242 (R454B)
Water cooled chiller with refrigerant gas R454B
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
Set of connector T-pieces for inlet and return flow, with union connector for Euro cone
Set of connector T-pieces for inlet and return flow, with union connector for Euro cone
Geberit
Set of connector T-pieces for inlet and return flow, with union connector for Euro cone
Set of connector T-pieces for inlet and return flow, with union connector for Euro cone
.Nova
Raccordo per uso meccanico
Geberit
Scarica
Set of connector T-pieces for inlet and return flow
Set of connector T-pieces for inlet and return flow
Geberit
Set of connector T-pieces for inlet and return flow
Set of connector T-pieces for inlet and return flow
.Nova
Raccordo per uso meccanico
Geberit
Scarica
Set of connector T-pieces for return flow copper
Set of connector T-pieces for return flow copper
Geberit
Set of connector T-pieces for return flow copper
Set of connector T-pieces for return flow copper
.Nova
Raccordo per uso meccanico
Geberit
Scarica
NX2-G02 0042 - 0222 (R410A)
Chiller, air source for outdoor installation with refrigerant type R410A
Climaveneta
NX2-G02 0042 - 0222 (R410A)
Chiller, air source for outdoor installation with refrigerant type R410A
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
NX2-G06 0042 - 0222 (R454B)
Chiller, air source for outdoor installation with refrigerant type R454B
Climaveneta
NX2-G06 0042 - 0222 (R454B)
Chiller, air source for outdoor installation with refrigerant type R454B
Conforme a EMCS
.DWG .RFA .IFC
Refrigeratore
Climaveneta
Scarica
POLYMELT MECHANICAL
POLYMELT MECHANICAL
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
POLYMELT
Scarica
POLYMELT ECOSAN
POLYMELT ECOSAN
Conforme a EMCS
.RVT .PDF
Raccordo per uso meccanico
POLYMELT
Scarica
Unità di manutenzione per vaso di espansione
Unità di manutenzione per i vasi di espansione SpiroExpand
Spirotech
Unità di manutenzione per vaso di espansione
Unità di manutenzione per i vasi di espansione SpiroExpand
Conforme a EMCS
.DWG .RFA .IFC
Valvola per uso meccanico
Spirotech
Scarica
HU4 Premium Line DPV SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU4 Base Line DPV SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU4 Premium Line DPV F
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU3 Base Line DPV MVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU3 Base Line DPV SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU3 Premium Line DPV SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU3 Premium Line DPV VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU3 Premium Line DPV F
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU2 Premium Line DPV SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU2 Premium Line DPV F
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU2 Premium Line DPV VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU2 Base Line DPV MVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU2 Base Line DPV SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPV6-10-15 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPV2-4 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPV6-10-15 VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPV6-15 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF40-60-85 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPV2-4 VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF40-85 SVP Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPV2-6 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF25 VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF25 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF40-85 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF25 SVP Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF25 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU6 Utility Line DPVF125 SVP Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPV6-10-15 VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF125 SVP Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPV6-15 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF25 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF25 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPV2-4 VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPV6-10-15 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF25 SVP Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPV2-4 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF40-60-85 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF40-85 SVP
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF40-85 SVP Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPV2-4 VC Cabinet D
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU5 Utility Line DPVF25 VC
Pressure boosting systems
Conforme a EMCS
.DWG .RFA .IFC
Pompa
DP-Pumps
Scarica
HU4 Utility Line DPVF125 SVP
Pressure boosting systems