diff --git a/Sources/DatabaseClient/Interface.swift b/Sources/DatabaseClient/Interface.swift
index 6c85b68..b003db9 100644
--- a/Sources/DatabaseClient/Interface.swift
+++ b/Sources/DatabaseClient/Interface.swift
@@ -74,7 +74,7 @@ extension DatabaseClient.Migrations: DependencyKey {
         EquipmentInfo.Migrate(),
         Room.Migrate(),
         EffectiveLength.Migrate(),
-        DuctSizing.TrunkSize.Migrate(),
+        TrunkSize.Migrate(),
       ]
     }
   )
diff --git a/Sources/DatabaseClient/TrunkSizes.swift b/Sources/DatabaseClient/TrunkSizes.swift
index 37f9d7c..8a31fea 100644
--- a/Sources/DatabaseClient/TrunkSizes.swift
+++ b/Sources/DatabaseClient/TrunkSizes.swift
@@ -7,13 +7,13 @@ import ManualDCore
 extension DatabaseClient {
   @DependencyClient
   public struct TrunkSizes: Sendable {
-    public var create: @Sendable (DuctSizing.TrunkSize.Create) async throws -> DuctSizing.TrunkSize
-    public var delete: @Sendable (DuctSizing.TrunkSize.ID) async throws -> Void
-    public var fetch: @Sendable (Project.ID) async throws -> [DuctSizing.TrunkSize]
-    public var get: @Sendable (DuctSizing.TrunkSize.ID) async throws -> DuctSizing.TrunkSize?
+    public var create: @Sendable (TrunkSize.Create) async throws -> TrunkSize
+    public var delete: @Sendable (TrunkSize.ID) async throws -> Void
+    public var fetch: @Sendable (Project.ID) async throws -> [TrunkSize]
+    public var get: @Sendable (TrunkSize.ID) async throws -> TrunkSize?
     public var update:
-      @Sendable (DuctSizing.TrunkSize.ID, DuctSizing.TrunkSize.Update) async throws ->
-        DuctSizing.TrunkSize
+      @Sendable (TrunkSize.ID, TrunkSize.Update) async throws ->
+        TrunkSize
   }
 }
 
@@ -26,7 +26,7 @@ extension DatabaseClient.TrunkSizes: TestDependencyKey {
         try request.validate()
 
         let trunk = request.toModel()
-        var roomProxies = [DuctSizing.TrunkSize.RoomProxy]()
+        var roomProxies = [TrunkSize.RoomProxy]()
 
         try await trunk.save(on: database)
 
@@ -90,7 +90,7 @@ extension DatabaseClient.TrunkSizes: TestDependencyKey {
   }
 }
 
-extension DuctSizing.TrunkSize.Create {
+extension TrunkSize.Create {
 
   func validate() throws(ValidationError) {
     guard rooms.count > 0 else {
@@ -113,7 +113,7 @@ extension DuctSizing.TrunkSize.Create {
   }
 }
 
-extension DuctSizing.TrunkSize.Update {
+extension TrunkSize.Update {
   func validate() throws(ValidationError) {
     if let rooms {
       guard rooms.count > 0 else {
@@ -128,7 +128,7 @@ extension DuctSizing.TrunkSize.Update {
   }
 }
 
-extension DuctSizing.TrunkSize {
+extension TrunkSize {
 
   struct Migrate: AsyncMigration {
     let name = "CreateTrunkSize"
@@ -192,7 +192,7 @@ final class TrunkRoomModel: Model, @unchecked Sendable {
     trunkID: TrunkModel.IDValue,
     roomID: RoomModel.IDValue,
     registers: [Int],
-    type: DuctSizing.TrunkSize.TrunkType
+    type: TrunkSize.TrunkType
   ) {
     self.id = id
     $trunk.id = trunkID
@@ -201,7 +201,7 @@ final class TrunkRoomModel: Model, @unchecked Sendable {
     self.type = type.rawValue
   }
 
-  func toDTO(on database: any Database) async throws -> DuctSizing.TrunkSize.RoomProxy {
+  func toDTO(on database: any Database) async throws -> TrunkSize.RoomProxy {
     guard let room = try await RoomModel.find($room.id, on: database) else {
       throw NotFoundError()
     }
@@ -240,7 +240,7 @@ final class TrunkModel: Model, @unchecked Sendable {
   init(
     id: UUID? = nil,
     projectID: Project.ID,
-    type: DuctSizing.TrunkSize.TrunkType,
+    type: TrunkSize.TrunkType,
     height: Int? = nil,
     name: String? = nil
   ) {
@@ -251,15 +251,15 @@ final class TrunkModel: Model, @unchecked Sendable {
     self.name = name
   }
 
-  func toDTO(on database: any Database) async throws -> DuctSizing.TrunkSize {
-    let rooms = try await withThrowingTaskGroup(of: DuctSizing.TrunkSize.RoomProxy.self) { group in
+  func toDTO(on database: any Database) async throws -> TrunkSize {
+    let rooms = try await withThrowingTaskGroup(of: TrunkSize.RoomProxy.self) { group in
       for room in self.rooms {
         group.addTask {
           try await room.toDTO(on: database)
         }
       }
 
-      return try await group.reduce(into: [DuctSizing.TrunkSize.RoomProxy]()) {
+      return try await group.reduce(into: [TrunkSize.RoomProxy]()) {
         $0.append($1)
       }
 
@@ -277,7 +277,7 @@ final class TrunkModel: Model, @unchecked Sendable {
   }
 
   func applyUpdates(
-    _ updates: DuctSizing.TrunkSize.Update,
+    _ updates: TrunkSize.Update,
     on database: any Database
   ) async throws {
     if let type = updates.type, type.rawValue != self.type {
@@ -340,15 +340,15 @@ final class TrunkModel: Model, @unchecked Sendable {
 
 extension Array where Element == TrunkModel {
 
-  func toDTO(on database: any Database) async throws -> [DuctSizing.TrunkSize] {
-    try await withThrowingTaskGroup(of: DuctSizing.TrunkSize.self) { group in
+  func toDTO(on database: any Database) async throws -> [TrunkSize] {
+    try await withThrowingTaskGroup(of: TrunkSize.self) { group in
       for model in self {
         group.addTask {
           try await model.toDTO(on: database)
         }
       }
 
-      return try await group.reduce(into: [DuctSizing.TrunkSize]()) {
+      return try await group.reduce(into: [TrunkSize]()) {
         $0.append($1)
       }
     }
diff --git a/Sources/ManualDClient/Helpers.swift b/Sources/ManualDClient/Helpers.swift
index 2969d2f..ee77d61 100644
--- a/Sources/ManualDClient/Helpers.swift
+++ b/Sources/ManualDClient/Helpers.swift
@@ -14,7 +14,7 @@ extension Room {
   }
 }
 
-extension DuctSizing.TrunkSize.RoomProxy {
+extension TrunkSize.RoomProxy {
 
   // We need to make sure if registers got removed after a trunk
   // was already made / saved that we do not include registers that
@@ -35,7 +35,7 @@ extension DuctSizing.TrunkSize.RoomProxy {
   }
 }
 
-extension DuctSizing.TrunkSize {
+extension TrunkSize {
 
   var totalHeatingLoad: Double {
     rooms.reduce(into: 0) { $0 += $1.totalHeatingLoad }
diff --git a/Sources/ManualDCore/DuctSizing.swift b/Sources/ManualDCore/DuctSizing.swift
index 39074b6..36f31d0 100644
--- a/Sources/ManualDCore/DuctSizing.swift
+++ b/Sources/ManualDCore/DuctSizing.swift
@@ -114,7 +114,7 @@ extension DuctSizing {
       self.ductSize = ductSize
     }
 
-    public subscript<T>(dynamicMember keyPath: KeyPath<DuctSizing.TrunkSize, T>) -> T {
+    public subscript<T>(dynamicMember keyPath: KeyPath<TrunkSize, T>) -> T {
       trunk[keyPath: keyPath]
     }
 
@@ -122,99 +122,4 @@ extension DuctSizing {
       ductSize[keyPath: keyPath]
     }
   }
-
-  // TODO: Add an optional label that the user can set.
-
-  // Represents the database model.
-  public struct TrunkSize: Codable, Equatable, Identifiable, Sendable {
-
-    public let id: UUID
-    public let projectID: Project.ID
-    public let type: TrunkType
-    public let rooms: [RoomProxy]
-    public let height: Int?
-    public let name: String?
-
-    public init(
-      id: UUID,
-      projectID: Project.ID,
-      type: DuctSizing.TrunkSize.TrunkType,
-      rooms: [DuctSizing.TrunkSize.RoomProxy],
-      height: Int? = nil,
-      name: String? = nil
-    ) {
-      self.id = id
-      self.projectID = projectID
-      self.type = type
-      self.rooms = rooms
-      self.height = height
-      self.name = name
-    }
-  }
-
-}
-
-extension DuctSizing.TrunkSize {
-  public struct Create: Codable, Equatable, Sendable {
-
-    public let projectID: Project.ID
-    public let type: TrunkType
-    public let rooms: [Room.ID: [Int]]
-    public let height: Int?
-    public let name: String?
-
-    public init(
-      projectID: Project.ID,
-      type: DuctSizing.TrunkSize.TrunkType,
-      rooms: [Room.ID: [Int]],
-      height: Int? = nil,
-      name: String? = nil
-    ) {
-      self.projectID = projectID
-      self.type = type
-      self.rooms = rooms
-      self.height = height
-      self.name = name
-    }
-  }
-
-  public struct Update: Codable, Equatable, Sendable {
-
-    public let type: TrunkType?
-    public let rooms: [Room.ID: [Int]]?
-    public let height: Int?
-    public let name: String?
-
-    public init(
-      type: DuctSizing.TrunkSize.TrunkType? = nil,
-      rooms: [Room.ID: [Int]]? = nil,
-      height: Int? = nil,
-      name: String? = nil
-    ) {
-      self.type = type
-      self.rooms = rooms
-      self.height = height
-      self.name = name
-    }
-  }
-
-  // TODO: Make registers non-optional
-  public struct RoomProxy: Codable, Equatable, Identifiable, Sendable {
-
-    public var id: Room.ID { room.id }
-    public let room: Room
-    public let registers: [Int]
-
-    public init(room: Room, registers: [Int]) {
-      self.room = room
-      self.registers = registers
-    }
-  }
-
-  public enum TrunkType: String, CaseIterable, Codable, Equatable, Sendable {
-    case `return`
-    case supply
-
-    public static let allCases = [Self.supply, .return]
-  }
 }
diff --git a/Sources/ManualDCore/Routes/ViewRoute.swift b/Sources/ManualDCore/Routes/ViewRoute.swift
index ebd82a3..ca5be24 100644
--- a/Sources/ManualDCore/Routes/ViewRoute.swift
+++ b/Sources/ManualDCore/Routes/ViewRoute.swift
@@ -668,9 +668,9 @@ extension SiteRoute.View.ProjectRoute {
     }
 
     public enum TrunkRoute: Equatable, Sendable {
-      case delete(DuctSizing.TrunkSize.ID)
+      case delete(TrunkSize.ID)
       case submit(TrunkSizeForm)
-      case update(DuctSizing.TrunkSize.ID, TrunkSizeForm)
+      case update(TrunkSize.ID, TrunkSizeForm)
 
       public static let rootPath = "trunk"
 
@@ -678,7 +678,7 @@ extension SiteRoute.View.ProjectRoute {
         Route(.case(Self.delete)) {
           Path {
             rootPath
-            DuctSizing.TrunkSize.ID.parser()
+            TrunkSize.ID.parser()
           }
           Method.delete
         }
@@ -690,7 +690,7 @@ extension SiteRoute.View.ProjectRoute {
           Body {
             FormData {
               Field("projectID") { Project.ID.parser() }
-              Field("type") { DuctSizing.TrunkSize.TrunkType.parser() }
+              Field("type") { TrunkSize.TrunkType.parser() }
               Optionally {
                 Field("height") { Int.parser() }
 
@@ -708,13 +708,13 @@ extension SiteRoute.View.ProjectRoute {
         Route(.case(Self.update)) {
           Path {
             rootPath
-            DuctSizing.TrunkSize.ID.parser()
+            TrunkSize.ID.parser()
           }
           Method.patch
           Body {
             FormData {
               Field("projectID") { Project.ID.parser() }
-              Field("type") { DuctSizing.TrunkSize.TrunkType.parser() }
+              Field("type") { TrunkSize.TrunkType.parser() }
               Optionally {
                 Field("height") { Int.parser() }
               }
@@ -732,17 +732,43 @@ extension SiteRoute.View.ProjectRoute {
     }
 
     public struct RoomRectangularForm: Equatable, Sendable {
+
       public let id: Room.RectangularSize.ID?
       public let register: Int
       public let height: Int
+
+      public init(
+        id: Room.RectangularSize.ID? = nil,
+        register: Int,
+        height: Int
+      ) {
+        self.id = id
+        self.register = register
+        self.height = height
+      }
     }
 
     public struct TrunkSizeForm: Equatable, Sendable {
+
       public let projectID: Project.ID
-      public let type: DuctSizing.TrunkSize.TrunkType
+      public let type: TrunkSize.TrunkType
       public let height: Int?
       public let name: String?
       public let rooms: [String]
+
+      public init(
+        projectID: Project.ID,
+        type: TrunkSize.TrunkType,
+        height: Int? = nil,
+        name: String? = nil,
+        rooms: [String]
+      ) {
+        self.projectID = projectID
+        self.type = type
+        self.height = height
+        self.name = name
+        self.rooms = rooms
+      }
     }
   }
 }
diff --git a/Sources/ManualDCore/TrunkSize.swift b/Sources/ManualDCore/TrunkSize.swift
new file mode 100644
index 0000000..819b7f4
--- /dev/null
+++ b/Sources/ManualDCore/TrunkSize.swift
@@ -0,0 +1,93 @@
+import Foundation
+
+// Represents the database model.
+public struct TrunkSize: Codable, Equatable, Identifiable, Sendable {
+
+  public let id: UUID
+  public let projectID: Project.ID
+  public let type: TrunkType
+  public let rooms: [RoomProxy]
+  public let height: Int?
+  public let name: String?
+
+  public init(
+    id: UUID,
+    projectID: Project.ID,
+    type: TrunkType,
+    rooms: [RoomProxy],
+    height: Int? = nil,
+    name: String? = nil
+  ) {
+    self.id = id
+    self.projectID = projectID
+    self.type = type
+    self.rooms = rooms
+    self.height = height
+    self.name = name
+  }
+}
+
+extension TrunkSize {
+  public struct Create: Codable, Equatable, Sendable {
+
+    public let projectID: Project.ID
+    public let type: TrunkType
+    public let rooms: [Room.ID: [Int]]
+    public let height: Int?
+    public let name: String?
+
+    public init(
+      projectID: Project.ID,
+      type: TrunkType,
+      rooms: [Room.ID: [Int]],
+      height: Int? = nil,
+      name: String? = nil
+    ) {
+      self.projectID = projectID
+      self.type = type
+      self.rooms = rooms
+      self.height = height
+      self.name = name
+    }
+  }
+
+  public struct Update: Codable, Equatable, Sendable {
+
+    public let type: TrunkType?
+    public let rooms: [Room.ID: [Int]]?
+    public let height: Int?
+    public let name: String?
+
+    public init(
+      type: TrunkType? = nil,
+      rooms: [Room.ID: [Int]]? = nil,
+      height: Int? = nil,
+      name: String? = nil
+    ) {
+      self.type = type
+      self.rooms = rooms
+      self.height = height
+      self.name = name
+    }
+  }
+
+  // TODO: Make registers non-optional
+  public struct RoomProxy: Codable, Equatable, Identifiable, Sendable {
+
+    public var id: Room.ID { room.id }
+    public let room: Room
+    public let registers: [Int]
+
+    public init(room: Room, registers: [Int]) {
+      self.room = room
+      self.registers = registers
+    }
+  }
+
+  public enum TrunkType: String, CaseIterable, Codable, Equatable, Sendable {
+    case `return`
+    case supply
+
+    public static let allCases = [Self.supply, .return]
+  }
+}
diff --git a/Sources/ProjectClient/Internal/ManualDClient+calculateDuctSizes.swift b/Sources/ProjectClient/Internal/ManualDClient+calculateDuctSizes.swift
index e529e7d..c09f78b 100644
--- a/Sources/ProjectClient/Internal/ManualDClient+calculateDuctSizes.swift
+++ b/Sources/ProjectClient/Internal/ManualDClient+calculateDuctSizes.swift
@@ -16,7 +16,7 @@ extension ManualDClient {
 
   func calculateDuctSizes(
     rooms: [Room],
-    trunks: [DuctSizing.TrunkSize],
+    trunks: [TrunkSize],
     sharedRequest: DuctSizeSharedRequest,
     logger: Logger? = nil
   ) async throws -> ProjectClient.DuctSizeResponse {
@@ -93,7 +93,7 @@ extension ManualDClient {
 
   func calculateTrunkSizes(
     rooms: [Room],
-    trunks: [DuctSizing.TrunkSize],
+    trunks: [TrunkSize],
     sharedRequest: DuctSizeSharedRequest,
     logger: Logger? = nil
   ) async throws -> [DuctSizing.TrunkContainer] {
@@ -190,7 +190,7 @@ extension Room {
   }
 }
 
-extension DuctSizing.TrunkSize.RoomProxy {
+extension TrunkSize.RoomProxy {
 
   // We need to make sure if registers got removed after a trunk
   // was already made / saved that we do not include registers that
@@ -211,7 +211,7 @@ extension DuctSizing.TrunkSize.RoomProxy {
   }
 }
 
-extension DuctSizing.TrunkSize {
+extension TrunkSize {
 
   var totalHeatingLoad: Double {
     rooms.reduce(into: 0) { $0 += $1.totalHeatingLoad }
diff --git a/Sources/ViewController/Extensions/TrunkSizeForm+extensions.swift b/Sources/ViewController/Extensions/TrunkSizeForm+extensions.swift
index 163607f..b1057c2 100644
--- a/Sources/ViewController/Extensions/TrunkSizeForm+extensions.swift
+++ b/Sources/ViewController/Extensions/TrunkSizeForm+extensions.swift
@@ -4,7 +4,7 @@ import ManualDCore
 
 extension SiteRoute.View.ProjectRoute.DuctSizingRoute.TrunkSizeForm {
 
-  func toCreate(logger: Logger? = nil) throws -> DuctSizing.TrunkSize.Create {
+  func toCreate(logger: Logger? = nil) throws -> TrunkSize.Create {
     try .init(
       projectID: projectID,
       type: type,
@@ -14,7 +14,7 @@ extension SiteRoute.View.ProjectRoute.DuctSizingRoute.TrunkSizeForm {
     )
   }
 
-  func toUpdate(logger: Logger? = nil) throws -> DuctSizing.TrunkSize.Update {
+  func toUpdate(logger: Logger? = nil) throws -> TrunkSize.Update {
     try .init(
       type: type,
       rooms: makeRooms(logger: logger),
diff --git a/Sources/ViewController/Views/DuctSizing/TrunkSizeForm.swift b/Sources/ViewController/Views/DuctSizing/TrunkSizeForm.swift
index 82521dc..b4a5b78 100644
--- a/Sources/ViewController/Views/DuctSizing/TrunkSizeForm.swift
+++ b/Sources/ViewController/Views/DuctSizing/TrunkSizeForm.swift
@@ -17,7 +17,7 @@ struct TrunkSizeForm: HTML, Sendable {
   let rooms: [DuctSizing.RoomContainer]
   let dismiss: Bool
 
-  var trunk: DuctSizing.TrunkSize? {
+  var trunk: TrunkSize? {
     container?.trunk
   }
 
@@ -56,7 +56,7 @@ struct TrunkSizeForm: HTML, Sendable {
           label(.class("select w-full")) {
             span(.class("label")) { "Type" }
             select(.name("type")) {
-              for type in DuctSizing.TrunkSize.TrunkType.allCases {
+              for type in TrunkSize.TrunkType.allCases {
                 option(.value(type.rawValue)) { type.rawValue.capitalized }
                   .attributes(.selected, when: trunk?.type == type)
               }
@@ -121,7 +121,7 @@ struct TrunkSizeForm: HTML, Sendable {
 
 }
 
-extension Array where Element == DuctSizing.TrunkSize.RoomProxy {
+extension Array where Element == TrunkSize.RoomProxy {
   func hasRoom(_ room: DuctSizing.RoomContainer) -> Bool {
     first {
       $0.id == room.roomID